Brace yourselves, summer is coming. As it happens every summer, the sales of advanced cooling solutions tend to increase this time of the year. This year a little more than usual, as many enthusiasts likely found the perfect excuse for an upgrade in light of the new Windows 10 release. Rising temperatures are a concern for both the casual user, who usually is just psychologically stressed by the higher temperature readings, and the advanced enthusiast, whose overclocked system is now facing random stability issues. And of course there are those who are simply annoyed by the increasing noise of their current cooling solution and are in need of something less intrusive.
Liquid-based cooling solutions are becoming easier to install and AIO kits generally are hassle-free, yet they are still not favored by the majority of the users. Their space requirements, increased complexity and price hold most people to simple air-based cooling solutions. After all, most advanced users are not quite convinced about the performance of AIO coolers to begin with, with some even claiming that air-based solutions can be as good or even better.
We have not had a review of simple air-based cooling solutions in a while here in AnandTech. With a new advanced testing setup and equipment, it makes sense to begin with roundup reviews, which present multiple current solutions and create a healthy reference database. However, there are thousands of air-based cooling products available and almost every one of them is designed for a specific purpose and target group. We had to start from a single category, therefore we simply requested from a number of companies to ship us whichever product they consider their best. Nine companies answered our call, alphabetically listed in the table below.
Product
Fans
Fan Speed(RPM)
Current Retail Pricing
be quiet! Dark Rock Pro 3
1 × 135mm1 × 120mm
14001700
$86.50
Cryorig R1 Ultimate
2 × 140mm
700-1300
$196**
Logisys (DeepCool)GamerStorm Assassin
1 × 140mm1 × 120mm
700-14001200
$56.90
Noctua NH-D15
2 × 140mm
300-1500
$93
Phanteks PH-TC14PE
2 × 140mm
700-1200
$80
Raijintek Tisis
2 × 140mm
600-1000
64€ (≈$72*)
Reeven Okeanos RC-1402
1 × 140mm1 × 120mm
300-1700300-1800
60€ (≈$54*)
SilentiumPC Grandis XE1236
2 × 120mm
500-1500
£34.90 (≈$45*)
Thermalright Macho Zero
-
-
$65 (no fan)
*As these coolers are not available in the US at the time of the review, these are the average retail prices in USD, excluding taxes.
**The Cryorig R1 Ultimate currently is available only through a foreign store registered in Amazon.com that ships from Korea. The current retail price is extremely bloated, far above the MSRP.
Be Quiet! is a German manufacturer of cooling, case and power PC-related products and one of the few European companies that has managed to push their way into the North American markets. We have checked a few of their power supplies in recent months and most recently saw their new cases and fans at Computex. For this review the company supplied us with the best and largest cooler they currently offer, the Dark Rock Pro 3.
The Dark Rock Pro 3 is supplied into a bizarrely shaped, deep cardboard box, well protected within thick layers of polyethylene foam and cardboard walls. A very basic black and white leaflet with installation instructions and the absolute necessary parts for the mounting of the cooler are supplied, nothing more, with the sole exception of two wire clips for those that want to install a third fan on the cooler.
Much as its name suggests, the Dark Rock Pro 3 is a very large, dark cooler. It is a symmetric dual tower design, meaning that the seven 6 mm heatpipes run through the base and to a separate cooling tower on either side. A metallic black top cover extends across the entire cooling body, covering both towers and the middle cooling fan but leaving the front fan exposed. With the exception of the black top cover, everything else is nickel-plated.
The front of each tower forms a jagged saw tooth design facing the fan that inclines inwards toward the center of the tower, while the rear forms a geometric pattern fashioned from half-octagons. The jagged front is supposed to reduce harsh airflow state transitions and aerodynamic noise, but the rear is most likely shaped for aesthetic purposes only.
The company is using their own SilentWings series fans on the Dark Rock Pro 3. The dimensions of each fan differs, with a 135 mm fan installed between the towers and an 120 mm fan at the front of the cooler. Still, both fans share the same features, such as the decoupling frames, wavy blades and six pole engines with fluid dynamic bearings. They are very high quality and expensive models, yet they are optimized for low noise operation, not high static pressure, which we will see the results of in the testing.
Be Quiet! paid a lot of attention to the base of the Dark Rock Pro 3. It is a very solid construct, forming a small heatsink, possibly to aid the overall performance of the cooler a little bit. The base has been polished to a perfect mirror finish, with no imperfections to be found.
Cryorig is a company that popped literally out of nowhere in 2013. They claim to be a company founded by experts with previous experience at other well-known companies, who banded together to both make a name for themselves and to offer "the best of all worlds". The R1 Ultimate that we have here today is the largest, most powerful cooler that they currently manufacture.
We received the R1 Ultimate well packed in a large cubic cardboard box. Everything inside the box is well packed and the bundle is well presented. Cryorig supplies the necessary hardware for the installation of the cooler, a tube of quality thermal grease and a long shank L screwdriver tool. The screwdriver tool is necessary for the installation of the cooler, unless if there is a >170 mm shank Philips PH2 screwdriver available. They also provide a third set of wire clips, for the installation of a third cooling fan.
The Cryorig R1 Ultimate is a very large dual tower cooler. Plastic frames partially cover each tower and are used as supports for the two 140 mm cooling fans. The fans are preinstalled and removing them is not necessary for the installation of the cooler. Each of the two towers has two series of fins. The silver front half of each tower consists of 42 fins, the black rear half of 53 fins. The company claims that by reducing the spacing halfway across each tower, they can accelerate the air exhaust, forcing the hot air to exit the tower faster. It is a rather peculiar approach, as a uniform gap across the entire tower could achieve the same air backpressure/speed without the extra turbulence and noise that the transition will cause. Perhaps Cryorig's research showed that this approach somehow improves thermal performance, by either thinning the boundary layer or simply through higher turbulence flow.
No strange shapes or patterns here - the front of the towers is entirely straight, with Cryorig apparently thinking that trying to improve anything by shaping the intake side of the fins is a waste of resources. The rear of the fins forms a simple geometric pattern, not just to improve the aesthetics of the cooler but also to provide insertion points for the provided screwdriver, which needs to be inserted in the gaps between the center fan and the fins for the installation of the cooler.
Cryorig is using two 140 mm fans, rebranded to their own company logo. They appear to be the same as the XF140 fans that the company retails as well. Aside from the "high precision low noise" bearing that the specifications vaguely describe, not much can be found about the fans, other than that they have a maximum speed of 1300 RPM. According to the specifications of the R1 Ultimate, they are also rated at 23 dB(A). This however is a little misleading, as this is the rating of a single fan in standard test conditions (unrestricted) within an anechoic chamber, not of two fans installed on the cooler itself.
The copper base and heatpipes of the R1 Ultimate have been nickel plated to prevent oxidization, a common upgrade for high-end products. The contact surface is very smooth but not polished down to a perfect mirror finish. In order to save a little room and install a seventh heatpipe, Cryorig placed the seven heatpipes in a slight convex formation.
Founded back in 1996, Deepcool (Logisys in the North American markets) is one of the oldest CPU cooler manufacturers. They are not a very well known brand name because they primarily focused on server and OEM coolers, not retail products. However, their recently launched "Gamer Storm" range comes to change that, with direct focus on retail products for advanced users. Deepcool provided us with their "Assassin" cooler for this review, the highest performance CPU cooler they currently market.
Deepcool supplies the Assassin in a very tall, large cardboard box with a relatively simple, dark artwork theme. Everything is exceptionally well packed inside the box, with everything protected inside secondary boxes and layers of polyethylene foam. The bundle consists of the hardware necessary for the mounting of the cooler, a fan power cable splitter and a Molex power adaptor, a tube of quality thermal grease, a metallic case badge and six wire clips for up to three cooling fans.
The Deepcool Gamer Storm Assassin is a very large and heavy dual tower cooler. It weighs more than 1.5 kg with both fans installed, making it one of the heaviest CPU coolers in existence. Each tower consists of fins forming a jagged saw tooth formation on one side and a complex geometric pattern formed of tetrahedrals and squares on the other side. Strangely, the towers are physically identical, yet they are reversed, meaning that one fan will be facing the jagged side of the fins and the other the complex tetrahedral-square pattern. This makes us unsure whether that strange pattern is for aesthetic purposes only or if it actually improves performance in any way. There are no openings for a screwdriver, therefore the center fan needs to be uninstalled during the installation/removal of the cooler. Furthermore, a Philips PH2 or a slotted 3.2 mm - 4 mm screwdriver with a shank longer than 150 mm is necessary. There is no tool provided in the box, therefore do make sure that you have an adequately long screwdriver available.
Deepcool provides two cooling fans alongside the Assassin, one 140 mm and one 120 mm fan. The 140 mm fan is to go in between the two towers, while the 120 mm fan on either side of the cooler. The company is obviously not using two 140 mm fans in order to provide some clearance to the RAM slots, which would be completely blocked if a 140 mm fan were to be mounted at the front side of the cooler.
The fans come from Deepcool's own UF range, have dual ball bearings and anti-vibration frame covers. A strange fact is that the 140 mm fan is faster than the 120 mm fan, with a maximum speed of 1400 RPM and 1200 RPM respectively. Deepcool is the only company that follows this approach, as the rest of the manufacturers with asymmetric fan setups seem to prefer the opposite, in order for both fans to have about equal airflow.
The base of the Assassin is very long, with eight 6 mm heatpipes running through it. This is another strange approach as there is no CPU long enough to make full contact with a base this long. It does not mean that the heatpipes near the edges of the base will be useless but it is unlikely that they will function at maximum efficiency. Both the copper base and the heatpipes of the Assassin are nickel plated, with the contact surface polished down to a perfect mirror finish.
Noctua is one of the world's most renowned cooler manufacturers. The company is especially well known for their high end and specialty products, aimed to those seeking extreme performance and or very low noise solutions. The cooler that the company provided us for this review is no other than the NH-D15, a behemoth based on the highly popular NH-D14.
The NH-D15 is supplied in a large cardboard box with a minimalistic, elegant design. Highlighting the main features of the cooler is the primary focus of the entire artwork. Inside the main box, we found the bundle packed into separate cardboard boxes and the cooler protected within a polyethylene foam construct. The bundle consists of the hardware necessary for the mounting of the cooler, an L type Philips PH2 screwdriver, a fan power cable splitter, two fan speed reducers, a tube of NT-H1 thermal grease, a metallic case badge, four rubber fan mounts and four wire clips for the two cooling fans.
Many people erroneously think that the NH-D15 is just a little larger version of the very popular NH-D14. The NH-D15 is a reverse-symmetric dual tower design based on the NH-D14, but there are numerous improvements. Noctua technically merged the core design of the NH-D14 with the fin design of the NH-U14S, which has the first seven fins of each tower shortened. This way, the NH-D15 can offer much wider compatibility with RAM modules if only the center fan is installed.
The rest of the fins are symmetric, meaning that both their sides are identical, which is mostly straight with a single small triangular notch at the center and a few more similar notches near the sides. In order to install/remove the NH-D15, the center fan needs to be removed. Another interesting point is that the fans can be moved upwards, several centimeters if needed be. Moving the front fan upward can allow the installation of tall RAM modules for a small impact on performance but it also requires a very wide case to do so.
Noctua provides two of their own NF-A15 140 mm fans alongside the NH-D15. Their brown/beige color is Noctua's trademark and unique to Noctua's products (or copies of them). These are very high quality fans, with SSO2 bearings (advanced liquid lubricated metallic bearings with magnetic stabilizers), rubber anti-vibration pads and ridged blades for airflow manipulation. For those that do not want to install the second fan on the cooler, because either they need to retain compatibility with certain RAM modules or they are simply satisfied with the performance of a single fan, Noctua provides rubber mounts for the installation of one NF-A15 as a case fan.
The base of the NH-D15 is relatively small in comparison to that of other coolers, yet obviously large enough to cover the entire surface of current CPUs. Most of the base is made out of copper, with steel parts used for retention, all nickel plated, along with the copper heatpipes as well. There are "only" six 6 mm heatpipes, the same number and size as with the older NH-D14, as Noctua clearly does not believe that enlarging the base and adding more heatpipes would make a notable performance difference. The contact surface is smooth and fairly well polished but not machined down to a perfect mirror finish.
Phanteks is another world-renowned CPU cooler manufacturer, whose high performance designs made them widely known very quickly. Aside from coolers and fans, the company is now active in the field of PC cases as well. For the means of this review, Phanteks supplied us with the PH-TC14PE, their largest and most popular CPU cooler. The PH-TC14PE actually is over two years old, making it the oldest design in this roundup review.
Phanteks supplies the PH-TC14PE in a large cardboard box with an abstract design showcasing the color variations of the cooler. Inside the box, the cooler is well protected within a polyethylene foam shell and the bundled items are secured in small boxes. Aside from the hardware necessary for the mounting of the cooler, Phanteks also provides a tube of quality thermal grease, six anti-vibration rubber strips for the fans, a fan power cable splitter, a fan speed reducer. They also provide six wire clips and twelve plastic fan clip adaptors, for the installation of up to three fans onto the cooler's body.
The PH-TC14PE is a very large symmetric dual tower cooler. The fronts of the fins form small circular notches, with the exception of the top fin that is straight and serves as a cover for the heatpipes as well. One of its prominent features is instantly apparent, which is the colored fins. There are five color variations of the PH-TC14PE and we received the black version. Phanteks calls this "Physical Antioxidant Thermal Shield" (or Physical Antioxidant Thermal Spraying - we found both in the company's texts) and claims that it enhances thermal performance by both increasing the dissipation rate of the heatsink itself and decreasing the radiation absorption rate from other heat sources. The fins are soldered on the heatpipes with another patented method that Phanteks calls "Cold Plasma Spraying Coating", which supposedly increases the heat transfer rate between the copper heatpipes and the aluminum fins.
Phanteks provides two of their own PH-F140 140 mm fans with the PH-TC14PE. The company loves abbreviations, so the PH-F140 have "Updraft Floating Balance (U.F.B)" bearings, "Maelstrom Vortex Booster (M.V.B)" blades and "Maelstrom Air-Fort Optimization (M.A.F.O)" drive systems. Other than the fancy names, no real technical data or schematics of these technologies can be found. All we are left with is their standard manufacturer specifications, which indicate a maximum speed rating of 1300 RPM (1200 RPM in PWM mode). The design of the wire clips allows the fans to be moved upwards by several centimeters, providing clearance to RAM modules and heatsinks that would otherwise be blocked, assuming that the case is wide enough of course.
The base of the PH-TC14PE is simplistic, virtually meant only to provide mechanical retention for the installation on a CPU. Five thick 8 mm heatpipes run through the base and to both fin arrays on either side. The copper bottom half of the base and the heatpipes are nickel-plated, with the contact surface polished fairly well but not down to a perfect mirror finish. Slight machine marks can be seen on the contact surface but there are no major imperfections to speak of.
Raijintek is yet another new European company, founded in 2013. For a company this new, Raijintek is retailing a fair number of products, which are thirteen coolers, four cases and several fans, with the company now expanding to peripherals and PSUs. The Tisis is Raijintek's most recent and advanced CPU cooler, which was originally baptized "Nemesis" but it was renamed due to a naming collision with another company's similar product.
The Tisis is supplied in a reasonably sized cardboard box with strong black/red artwork on it, focused around a picture of the cooler itself. Inside the box everything is well packed and the cooler is protected inside a polyethylene foam shell. Despite the obviously very rough time our sample had during its shipping to us, everything inside the box was unscathed.
Raijintek kept the bundle to the minimum of things required. Aside from the hardware and thermal grease necessary for the mounting of the cooler and a long L-type Philips PH2 screwdriver, nothing else is provided. It is however noteworthy to mention that there are no wire clips for the fans as this is the only cooler in this roundup review that is using rubber mounts instead.
There are two 140 mm fans provided inside the package, both with a red frame and white blades. There is nothing prominent about the fans, with the exception of the partially jagged blades. The OEM is recognizable and is PelHong Technology, a Chinese manufacturer. Both fans are identical, have engines with sleeve bearings and a relatively low maximum speed of just 1.000 RPM.
The Raijintek Tisis is a very large asymmetric dual tower cooler, with the towers completely different from each other. The fins of the front tower are larger and both of their fan-facing sides are jagged, while the fins of the rear tower are smaller and their sides are completely straight. Furthermore, the fins of the front tower have folded sides, effectively forming a wind tunnel that prevents the air from exiting from the sides. Openings for the rubber mounts of the cooling fans can be clearly seen. This method is a little more convenient than wire clips but it also prevents the adjustment of the fan's height, removing the possibility to raise the front fan a little bit to increase the RAM modules clearance.
The copper base and heatpipes of the Tisis are nickel-plated and polished, especially the contact surface that has been machined down to a perfect mirror finish. Five thick 8 mm heatpipes go through the relatively small base of the Tisis and expand to both fin arrays. For the installation of the cooler, the middle fan needs to be removed, as there is no other way for the screwdriver to reach the base of the cooler.
Reeven is a Taiwanese newcomer in the industry. Naturally, most people reading this probably never even heard the company name before today. The company was founded just over a year ago and currently only offers CPU coolers, fans and fan controllers. Reeven sent us their most powerful CPU cooler as well, the Okeanos (RC-1402).
The box that the Reeven comes supplied in is relatively small. Nevertheless, the protection appears adequate, with polyethylene foam protecting the cooler and the bundled items packed inside a cardboard box.
The bundle is a little crudely packed and virtually kept to a minimum. Reeven supplies only the hardware necessary for the mounting of the cooler, a single dose of thermal grease, wire clips for up to three cooling fans, speed reducers for the two provided fans and a leaflet with basic installation instructions.
Reeven supplies two cooling fans alongside with the Okeanos, one 120 mm and one 140 mm fan. Both fans have black frames and genista yellow blades. These are relatively simple models, with sleeve bearings, lacking fancy blades or vibration absorbers. There is one thing of note about these two fans though: they are ridiculously powerful, with the 140 mm and the 120 mm fan rated for a maximum speed of 1700 RPM and 1800 RPM respectively.
The Okeanos is a symmetric dual tower CPU cooler, with strangely narrow towers for its class. Although the difference is very small, the fins of each tower are not precisely geometrically symmetric, with the front side having three small and the rear side one long indentations. The top fin is a 1 mm thick aluminum cover with the company logo punched on it.
The wire fan installation clips do allow moving the front fan upwards in order to gain some RAM clearance - as long as the case is wide enough, of course. Installation-wise, they are a bit of a pain, as Reeven's approach is far too crude, with the wire clips just going straight into the fan holes and clipping onto the side of the fan.
Furthermore, the frame of the 120 mm fan just barely touches the extruded sides of the fins. It is very easy for the 120 mm fan to be installed with only one side on the extruded fins, increasing noise and reducing performance.
Even though the Okeanos initially looks very simple, the bottom of the cooler makes it very interesting. The base is split between a nickel-plated copper lower part and a steel top part, providing mechanical cohesion and retention. In between these two parts, there are six heatpipes, secured with a very generous amount of solder. The two central heatpipes are 8 mm thick, while the other four heatpipes are 6 mm thick, making this the only cooler with an asymmetric heatpipe configuration in our review. The contact surface is well polished and free of imperfections, yet not machined down to a perfect mirror finish.
SilentiumPC is a Polish company that is fairly well known in Europe, yet with virtually no presence in the North American markets. The company was founded in 2007, aiming to provide a wide variety of cooling and case solutions at competitive prices. For the means of this review, SilentiumPC provided us with the Grandis XE1236, which currently is the best cooler the company produces.
The Grandis is supplied in an aesthetically plain but effective cardboard box. There is nothing of note regarding the appearance of the packaging, as the only artwork is a picture of the cooler itself. It does offer good shipping protection though, with the cooler protected inside a clear plastic shell and the bundled items grouped in secondary cardboard boxes.
With the company focused on minimizing the costs, we did not expect the bundle of the Grandis to be grand. Nevertheless, besides the necessary mounting hardware and wire clips for three fans, SilentiumPC provides a tube of quality Pactum PT-1 thermal compound and a Y 4-pin fan power splitter. A small wrench tool is also provided, necessary for the installation of the cooler.
The Grandis is supplied with two 120 mm cooling fans. Both fans are mechanically and electrically identical, with black solid frames and tinted black blades. They have been rebranded and it is difficult to recognize their OEM. Their electrical specifications, speed and sleeving type match the Power Logic PL12S12L, yet the acoustic ratings are worlds apart.
The Grandis XE1236 is a symmetric dual tower CPU cooler, with relatively narrow towers for its class. The fins of both towers are perfectly symmetric as well, meaning that both their front and rear sides are identical, mostly straight with shallow indentations near their center. SilentiumPC died the top fin black, obviously for aesthetic purposes only, but it does not cover the copper heatpipes.
Up to three 120 mm cooling fans can be installed on the Grandis, using the provided wire clips. The wire clips are strangely shaped and very wide, expanding above and below the cooling fans. This makes them flimsy and prevents the movement of the front fan upwards to offer clearance for the RAM modules, if necessary. The center fan will have to be removed for the installation of the cooler, as there are no holes for a screwdriver. Do note that a Philips PH2 screwdriver with a shank longer than 145 mm is necessary for the installation of the Grandis, which is not supplied.
The base of the Grandis XE1236 is about as simple as the rest of the cooler is. It is split into two parts: the narrow lower copper part serves as the contact surface and the aluminum/steel top part provides mechanical cohesion and retention. Six 6 mm copper heatpipes expand from the base of the cooler to either tower on both sides, evenly spaced at the right and the left half of each tower. In order to keep the costs down, SilentiumPC did not plate the copper parts of the Grandis. The quality of the contact surface is disappointing, not because it has not been polished at all but because there are multiple machining marks visible with the naked eye and easily feelable by touch.
Being one of the oldest and most reputable manufacturers of advanced cooling solutions, Thermalright does not really need much of an introduction in such a review. Ever since 2001, Thermalright is totally focused on designing and producing cooling solutions for PC components, with the mere exception of a heatsink for the XBOX 360. The company greatly surprised us with their submission for this review. With this being a roundup review of top performance coolers, almost anyone would expect to see the Silverarrow or HR-22 (or a Copper TRUE? - Ian). However, Thermalright submitted the Macho Zero - a cooler optimized for passive performance and low airflow environments!
Thermalright supplies the Macho Zero in a very plain black cardboard box, with just a schematic of the cooler printed on it. Inside the box, the cooler is very well protected inside thick polyethylene foam pieces. Note that the Macho Zero is not supplied with a fan. For the means of this review, Thermalright supplied us with a single TY-147A 140 mm fan.
The bundle of the Macho Zero is the most thorough of this review. Thermalright nickel-plated the screws and retention plates necessary for the mounting of the cooler, supplies a tube of quality "Chill Factor III" thermal paste, anti-vibration rubber pads and wire clips for one cooling fan, provides a full size magnetic 150 mm shank Philips PH2 screwdriver and even gloves for the installation of the cooler.
Although the Macho Zero is primarily optimized for semi-passive cooling, meaning that it has been designed to make use of the airflow generated by the fans of the case, it is possible to install any 120 mm or 140 mm fan on it. For the means of this review, the cooler had to be in active configuration, therefore Thermalright supplied us with a TY147A 140 mm fan. The white bladed fan with the rounded frame is a model designed for efficient airflow and low-noise operation. This means that the fan is optimized for low impedance applications, such as to replace case fans. Normally, that would make it mediocre for a very dense cooler, but that is not the case with the Macho Zero. It has a maximum rotational speed of 1300 RPM and an "enhanced hyper-flow bearing", for which we could not find specific information about, but it definitely is a form of fluid sleeve-type mechanism.
The Macho Zero is an imposing, large single tower CPU cooler. Its fins are almost perfectly rectangular, with many openings across their great surface. There are not too many fins though, as the spacing between them is very large in comparison to other coolers. This has been done to optimize this cooler for very low airflow environments and greatly lowers its airflow impedance. For aesthetic purposes, Thermalright painted the top fin black, yet it does not cover the heatpipe endings. There is a fairly large hole near the rear side of the fins, meant for the screwdriver to go through for the mounting of the cooler. Note that for the mounting of this cooler, the front fan (if present) needs to be removed as well.
Typically, the Macho Zero is designed for use without a fan. An optional fan can be used of course, but remember that high airflow / low pressure options are likely to be far more effective than high pressure fans. The provided wire clips are an excellent fit for 140 mm fans with rounded frames, yet their configuration does not allow the adjustment of the fan's height. It would be wise to check the mechanical specifications of the cooler and make sure that the installation of a fan does not restrict the installation of RAM modules in slots that need to be used.
The base of the Macho Zero is of notable importance. The copper base is rectangular and wide to provide full contact with Haswell-E processors, with six 6 mm heatpipes going through it. The heatpipes are split into two groups, with heatpipes 1-3-5 expanding near the rear of the heatsink and heatpipes 2-4-6 near the front. This approach allows the localized generation of a heavy thermal load to be split across the surface of the fins. Everything is nickel plated and the contact surface is treated to a perfect mirror finish.
Although the testing of a cooler appears to be a simple task, that could not be much further from the truth. Proper thermal testing cannot be performed with a cooler mounted on a single chip, for multiple reasons. Some of these reasons include the instability of the thermal load and the inability to fully control and or monitor it, as well as the inaccuracy of the chip-integrated sensors. It is also impossible to compare results taken on different chips, let alone entirely different systems, which is a great problem when testing computer coolers, as the hardware changes every several months. Finally, testing a cooler on a typical system prevents the tester from assessing the most vital characteristic of a cooler, its absolute thermal resistance.
The absolute thermal resistance defines the absolute performance of a heatsink by indicating the temperature rise per unit of power, in our case in degrees Celsius per Watt (°C/W). In layman's terms, if the thermal resistance of a heatsink is known, the user can assess the highest possible temperature rise of a chip over ambient by simply multiplying the maximum thermal design power (TDP) rating of the chip with it. Extracting the absolute thermal resistance of a cooler however is no simple task, as the load has to be perfectly even, steady and variable, as the thermal resistance also varies depending on the magnitude of the thermal load. Therefore, even if it would be possible to assess the thermal resistance of a cooler while it is mounted on a working chip, it would not suffice, as a large change of the thermal load can yield much different results.
Appropriate thermal testing requires the creation of a proper testing station and the use of laboratory-grade equipment. Therefore, we created a thermal testing platform with a fully controllable thermal energy source that may be used to test any kind of cooler, regardless of its design and or compatibility. The thermal cartridge inside the core of our testing station can have its power adjusted between 60 W and 340 W, in 2 W increments (and it never throttles). Furthermore, monitoring and logging of the testing process via software minimizes the possibility of human errors during testing. A multifunction data acquisition module (DAQ) is responsible for the automatic or the manual control of the testing equipment, the acquisition of the ambient and the in-core temperatures via PT100 sensors, the logging of the test results and the mathematical extraction of performance figures.
Finally, as noise measurements are a bit tricky, their measurement is being performed only manually. Fans can have significant variations in speed from their rated values, thus their actual speed during the thermal testing is being acquired via a laser tachometer. The fans (and pumps, when applicable) are being powered via an adjustable, fanless desktop DC power supply and noise measurements are being taken 1 meter away from the cooler, in a straight line ahead from its fan engine. At this point we should also note that the Decibel scale is logarithmic, which means that roughly every 3 dB(A) the sound pressure doubles. Therefore, the difference of sound pressure between 30 dB(A) and 60 dB(A) is not "twice as much" but nearly a thousand times greater. The table below should help you cross-reference our test results with real-life situations.
The noise floor of our recording equipment is 30.2-30.4 dB(A), which represents a medium-sized room without any active noise sources. All of our acoustic testing takes place during night hours, minimizing the possibility of external disruptions.
<35dB(A)
Virtually inaudible
35-38dB(A)
Very quiet (whisper-slight humming)
38-40dB(A)
Quiet (relatively comfortable - humming)
40-44dB(A)
Normal (humming noise, above comfortable for a large % of users)
44-47dB(A)*
Loud* (strong aerodynamic noise)
47-50dB(A)
Very loud (strong whining noise)
50-54dB(A)
Extremely loud (painfully distracting for the vast majority of users)
>54dB(A)
Intolerable for home/office use, special applications only.
*noise levels above this are not suggested for daily use
*Note: When the cooler has two different fans, the fan speed of the faster fan is recorded.
We should start by noticing that one should be extremely careful when reading the performance charts. Even though some of the coolers are of similar design or size, their performance differs greatly. Similarly, coolers with similar thermal performance may have great differences in size, acoustics and or price.
Without a doubt, the grandest example of this warning is the Okeanos. Reeven's offering outpaces nearly every other cooler, comparing directly with Noctua's and Cryorig's finest, when tested at our maximum load and has the best average absolute thermal resistance. However, this is not due to excelling technology or design. On the contrary, the Okeanos is simpler and smaller than most of the coolers in this review. This achievement is simple brute force through high speed fans, which places the Okeanos far behind any other offering on acoustics.
Not unexpectedly, the thermal performance charts are being led by the Noctua NH-D15, the Cryorig R1 Ultimate and the Phanteks TC14PE. These are the best coolers of the most renowned manufacturers, so one would expect interative designs over time to yield benefits. The performance differences between these three offerings, thermal and acoustic alike, are very small. Raijintech's Tisis is the surprise of this review, with similar thermal and acoustics performance to that of the best coolers. The Tisis also has the best low load performance, where the charts shift greatly.
The Dark Rock Pro 3 from Be Quiet! offers lower noise levels but falls a little behind on thermal performance. Not the same can be said about Deepcool's offering, the Assassin, which does not match the thermal performance of the best coolers but is neither quieter nor notably cheaper. The performance gap is rather small but the Assassin is at a disadvantage. The Grandis falls even further behind in terms of thermal performance while the noise levels are similar, but SilentiumPC designed it to be more budget-friendly than other offerings, not to compete with the elite on terms of raw performance. Thermalright's Macho Zero is also an inconsistency in this review, as this cooler is not meant to provide maximum thermal performance and hits the bottom of our absolute thermal resistance charts. On the other hand, the Macho Zero paired with the TY147A is by far the quietest cooler in this review, being whisper-quiet even while the fan is spinning at maximum speed.
*Note: When the cooler has two different fans, the fan speed of the faster fan is recorded.
**Note: Some of this review's PWM fans will not start if simply powered from a 7 Volts power source. Electronic supervision is required to start the fan and then reduce the voltage down to 7 Volts, or a PWM source.
Reducing the fan voltage down to 7 Volts shifts the thermal performance charts a little but brings all of the coolers down to virtually inaudible levels. The sole exception is the Okeanos, which definitely improved vastly in comparison to having its fans running at maximum speed, but remains audible.
With the Okeanos losing its advantage of brute force, the Noctua NH-D15 and the Raijintek Tisis now lead the thermal performance charts, closely followed by Cryorig's R1 Ultimate. The Phanteks PH-TC14PE is a bit more complicated, displaying that it can do much better at lower loads than with high loads, hinting that the airflow of the fans is simply not enough for this design to cope with very high loads. Be Quiet!'s Dark Rock Pro 3 is now showing thermal performance comparable to that of the aforementioned coolers, especially when the thermal load is low. Still, the Dark Rock Pro 3 technically loses its acoustics performance advantage. It may be dead-silent, with our equipment unable to record anything about the room's noise floor level, but the rest of the coolers are virtually inaudible as well.
The Thermalright Macho Zero is at advantage in these tests, as the cooler is optimized for low airflow situations. With the TY147A at a dead-quiet operating level, the Macho Zero offers very good thermal performance, especially at lower loads.
The two coolers with the worst overall thermal performance at this test were the Deepcool Assassin and the SilentiumPC Grandis. As far as the Grandis is concerned, the company will definitely not worry about their product not being able to compete directly with the best air coolers available, as it can still offer very good performance for the price of the cooler. The Assassin on the other hand fails to compete as well as it should, falling behind all other similarly sized products and even behind the Grandis during most of these tests.
It goes without saying that the selection of a CPU cooler is not easy. Each user has different requirements and needs. Even if we select a very specific group, such as those who are seeking the best air-based cooling solutions possible, there are different levels of tolerance to noise and different budgets. Furthermore, certain coolers could cause compatibility problems with the case or the RAM. All performance and physical aspects need to be taken into account by each individual user, weighing which option is the best for a specific application.
If thermal performance were the top priority, it would be very difficult to select between the Noctua NH-D15, the Cryorig R1 Ultimate, the Phanteks TC14PE and the Raijintek Tisis. All four of these coolers have similar thermal performance overall, with the Tisis and the NH-D15 showing a little better performance at lower loads and slightly lower noise levels. All four of these coolers are of comparable manufacturing quality as well; at least as long as the body of the cooler is concerned. A selection between these four coolers generally becomes a matter of compatibility, availability and pricing.
Noctua and Phanteks are known for their support and their willingness to offer mounting kits for new sockets, plus their design allows their front fans to be raised and increase the RAM clearance, gaining several points on compatibility. Cryorig's R1 Ultimate is visually very lustrous but its availability is extremely low. Furthermore, its plastic frame design prevents the fan to be moved up more than a few mm's, limiting RAM compatibility beneath the cooler. The Raijintek Tisis has the advantage of lower pricing but its availability is limited and its fans cannot be adjusted in terms of height at all.
When thermal performance becomes the only priority, the Reeven Okeanos overtakes the competition through sheer force. The relatively small and simple cooler hits the top of our thermal resistance charts, demonstrating the best thermal performance of this roundup review. However, this performance is solely based on its high speed fans, making the Okeanos by far the loudest cooler of this review as well. Furthermore, its availability is very low as Reeven still has very low market penetration and production. It would be easy to recommend the Okeanos to those who do not care about noise at all, but the blunt truth is that everyone does care about noise. It may not be the first priority but it definitely is a major selling factor, as nobody likes a noisy device, limiting the potential of the Okeanos.
Be Quiet!'s Dark Rock Pro 3 is clearly designed with acoustics and quality as the priorities, which generally are the focus and trademark of the company. It may be falling a little behind on thermal performance but it does deliver the promised lower noise levels. Furthermore, it is a high quality construct and comes with very high quality fans, improving its competitiveness. The acoustics performance of the Dark Rock Pro 3 is only challenged by the irregularity of our review, the Thermalright Macho Zero, a cooler designed for very low airflow environments. When paired with Thermalright's own TY-147A fan, the Macho Zero cannot offer the same thermal performance as the rest of the coolers but it is practically noiseless. Its wide fin spacing has very low airflow impedance, making the cooler optimized for semi-fanless operation. This means that the Macho Zero is designed to rely on the airflow of a case and operate without a fan at all, or to operate with a high-CFM case fan installed on it. Because of the low airflow impedance, the noise level of the Macho Zero is notably lower than that of conventional coolers, while it does offer good thermal performance. For those that acoustics are a primary concern, the Macho Zero definitely holds a major advantage.
The last two coolers of this review are the SlientiumPC Grandis XE1236 and the Deepcool Assassin. The former is by far cheaper than any other solution of this review and, considering its thermal performance, we wonder if it would be more reasonable to compare it against middle-range coolers, not the largest and mightiest behemoths out there. The only real comparison with the rest of the coolers in this review is its size and dual tower design. SilentiumPC however does not exaggerate, openly claiming that the primary design factor of their products is cost. True enough, the Grandis XE1236 is very competitively priced and offers acceptable overall performance, making it a very interesting solution for users on a tight budget. The Deepcool Gamerstorm Assassin is a more complicated matter. The design, size and, until recently, the price of this cooler were hinting that the Assassin is on par with the best coolers out there. However, despite its grandiose appearance, the Assassin generally fails to impress and it would be in great trouble if a massive price cut would not take place just a few days ago. With its retail price reduced by 25-30%, the Assassin becomes a viable solution, competing in terms of value rather than performance, making it a higher quality solution over the Grandis at an acceptable cost.
Ultimately, if our conclusions could be summarized in a single table, it would be this:
9-Way CPU Cooler Quick Conclusions
Priority
Cooler
Reason
Best Thermal
Performance
Noctua NH-D15$93
Reeven Okeanos60€ (≈$54*)
If raw thermal performance is the only concern, these two air-based coolers offer the best there is. Arguably, the Okeanos is far too loud but, even though the high performance solely comes from strong fans, it retails for nearly half the price of the NH-D15. Therefore, the final selection depends on secondary targets and the budget.
Quietest
Thermalright Macho Zero$65 (no fan)
Be Quiet! Dark Rock Pro 3$86.50
When low noise is the primary selection factor, Thermalright wins hands down. Be Quiet!'s Dark Rock Pro 3 would be our next choice, as it is a complete solution with fans and offers better thermal performance at comparatively low noise levels.
Best Value
SilentiumPC Grandis XE1236£34.90 (≈$45*)
Phanteks TC14PE$80
Out of the nine coolers of this review, the Grandis may not be the best performer but it is by far the cheapest. For those that are satisfied with good performance and just want a good cooler, it will not disappoint. For those in the US, Phanteks' TC14PE offers very good quality and performance at a competitive price.
Realistic selection
(or what I, as an enthusiast/overclocker, would buy)
Noctua NH-D15$93
To my eyes, Noctua's NH-D15 is the most balanced product of this review. It offers excellent thermal performance at reasonable noise levels, the quality is exceptional, all while the retail price is not extravagant.