heading NH-U9 TR4-SP3 SPECIFICATIONS VIDEOS REVIEWS SERVICE ACCESSORIES BUY Having received more than 300 awards and recommendations from international hardware websites and magazines, Noctua’s NH-U9 line has become a benchmark for compact 92mm single tower coolers. The TR4-SP3 version is a tailored custom model for AMD’s TR4/SP3 platform (Ryzen Threadripper / Epyc) and features a larger contact surface as well as the latest SecuFirm2™ mounting system for socket TR4/SP3. Topped off with two of the renowned quiet NF-A9 PWM 92mm fans in a push/pull dual fan configuration, Noctua’s proven NT-H1 thermal compound and a full 6-year manufacturer’s warranty, the NH-U9 TR4-SP3 forms a highly compact, premium-quality solution that combines outstanding performance, superb acoustics and excellent compatibility for space-restricted TR4/SP3 systems. Please note that the NH-U9 TR4-SP3 is a dedicated version for the AMD TR4/SP3 socket. Due to its customised larger base, it cannot be used on any other sockets and is incompatible with Noctua’s standard mounting kits. ✕ Details Award-winning NH-U series The NH-U9 TR4-SP3 stems from Noctua's award-winning NH-U9 series. First introduced in 2005, the NH-U series has become a standard choice for premium quality quiet CPU coolers and won more than 1000 awards and recommendations from leading international hardware websites and magazines. Tailored custom version for TR4/SP3 (Ryzen Threadripper / Epyc) At 70x56mm, the copper contact surface of the TR4-SP3 version is more than double the size of the standard model. Tailored to fit the enormous integrated heat-spreaders (IHS) of AMD’s TR4/SP3-based processors, this customised design allows for an optimal heat flow from the CPU over the base to the heatpipes and on to the cooling fins. Compact 92mm size for best compatibility Thanks to a total width of only 95mm, the NH-U9 TR4-SP3 provides 100% PCIe clearance and never overhangs the top PCIe x16 slot. At the same time, its height of only 125mm allows it to fit smaller cases and most 4U size rack-mount enclosures. Dual NF-A9 PWM fans The NH-U9 TR4-SP3 is equipped with two of Noctua’s award-winning NF-A9 PWM 92mm fans. This push/pull dual fan configuration allows it to achieve a level of quiet cooling performance that is remarkable for such a compact cooler and comes close to the bigger NH-U12S TR4-SP3. PWM support and Low-Noise Adaptors The NF-A9 premium fans supplied with the NH-U9 TR4-SP3 support PWM for convenient automatic speed control through the motherboard. In addition, the maximum fan speed can be reduced from 2000 to 1550rpm using the supplied Low-Noise Adaptors for even quieter operation. SecuFirm2™ mounting system for TR4/SP3 Noctua’s SecuFirm2™ mounting systems have become synonymous with quality, safety and ease of use. The TR4-SP3 variant has been completely custom-designed for the new socket and is particularly easy to install: Put on the heatsink, fix the four spring-loaded screws and you’re done! NT-H1 thermal compound Noctua's much-acclaimed NT-H1 is a well proven pro-grade TIM solution that provides minimum thermal resistance, excellent ease-of-use and outstanding reliability, which makes it suitable for use in professional server and workstation environments. 6-year manufacturer’s warranty Noctua products are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the supplied NF-A9’s feature an MTTF rating of more than 150,000 hours and the entire NH-U9 TR4-SP3 package comes with a full 6-year manufacturer’s warranty. See all 41 reviews for this product See all 31 reviews for this product General Notes and warnings Please note that the NH-U9 TR4-SP3 is a dedicated version for the AMD TR4/SP3 socket. Due to its customised larger base, it cannot be used on any other sockets and is incompatible with Noctua’s standard mounting kits. Cooler Specification Socket compatibility AMD TR4 & SP3 Height (without fan) 125 mm Width (without fan) 95 mm Depth (without fan) 71 mm Weight (without fan) 660 g Height (with fan) 125 mm Width (with fan) 95 mm Depth (with fan) 120 mm Weight (with fan) 895 g Material Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating Max. TDP see CPU compatibility list Fan compatibility 2x 92x92x25mm Scope of delivery 2x NF-A9 PWM premium fan 2x Low-Noise Adaptor (L.N.A.)Y-split cableNT-H1 high-grade thermal compoundSecuFirm2™ mounting kit for TR4/SP3Noctua metal case-badge Warranty 6 Years FAN Specification Model Noctua NF-A9 PWM Bearing SSO2 Max. rotational speed (+/- 10%) 2000 RPM Max. rotational speed with L.N.A. (+/- 10%) 1550 RPM Min. rotational speed (PWM, +/-20%) 400 RPM Max. airflow 78,9 m³/h Max. airflow with L.N.A. 62,6 m³/h Max. acoustical noise 22,8 dB(A) Max. acoustical noise with L.N.A. 16,3 dB(A) Input power 1,2 W Voltage range 12 V MTTF > 150.000 h 09.08.2018 // Tom's Hardware NH-U9 TR4-SP3 Review Noctua served up a trio of great performing air coolers designed specifically for AMD’s flagship processors, Threadripper, and its server equivalent, Epyc. As we begin to see market additions for slimmer workstation chassis and smaller enthusiast motherboards to support the TR4 and SP3 sockets, the need to have a high-performance, compact cooling solution continues to grow. The fact that the NH-U9 TR4-SP3 performs like coolers much larger is both brilliant and promising. Noctua has shown that excellent air cooling does not require a massive cooling tower to be affixed within a PC case in order to achieve overclocking goals. This cooler steps in as The Little Engine That Could by doing the same job just as well, or even better, than larger cooling options on the market. Test verdict: "The NH-U9 TR4-SP3 should most definitely reside on any builder’s list for a compact Threadripper build." (Garrett Carver, Tom's Hardware) 04.10.2017 // LegitReviews.com NH-U9 TR4-SP3 Review The results from this benchmark were rather shocking as the Thermaltake Floe Triple Riing RGB 360 TT Premium Edition ($199.99 shipped) AIO CPU liquid cooler didn’t blow the Noctua coolers out of the water. The Thermaltake Floe Triple Riing RGB 360 had the lowest idle temperature by 1C, but the load temps were nearly 2C higher than the Noctua NH-U14S. These Noctua air coolers do a pretty good job! Test verdict: "It is shocking how well these three high-end heatsinks from Noctua handle AMD’s TR4 and SP3 sockets for their latest Ryzen Threadripper (X399) and EPYC platforms." (Nathan Kirsch, LegitReviews.com) 21.08.2017 // ComputerBase.de NH-U9 TR4-SP3 Review Bei dem Temperaturen zeigt sich die All-in-One-Wasserkühlung nur für wenige Minuten überlegen, denn das Wasser zu erhitzen braucht seine Zeit. Nach 30 Minuten Last mit Prime95 steht ein Patt mit dem NH-U14S zu Papier. So lange die AiO braucht um auf Touren zu kommen, so lange braucht sie im Anschluss auch wieder um ruhiger zu werden: Ein Luftkühler hat nach wenigen Sekunden im Leerlauf die Drehzahl bereits wieder abgesenkt, weil die CPU nur noch minimale Abwärme erzeugt, bei der AiO dauert das länger. Test verdict: "Als potentiell erste erhältliche Luftkühler für AMDs neuer Threadripper-Plattform machen Noctua NH-U14S, -U12S und -U9 für Sockel TR4 eine sehr gute Figur. Das Topmodell NH-U14S schlägt bei der Temperatur sogar eine 200 US-Dollar teure AiO-Wasserkühlung von Thermaltake mit großem 360er-Radiator." (Volker Rißka, ComputerBase.de) 18.12.2018 // DDWorld.cz NH-U9 TR4-SP3 Review Jak vidíte, uchladit moderní multijádrové procesory dá docela práci a klasické vzduchové chladiče zde už ukazují své limity. A to RYZEN 2950X není zdaleka nejvýhřevnější procesor na trhu, to Core i9 dokáže topit ještě mnohem více. Takže ano, všechny chladiče včetně malé 92mm NOCTUA U9 jsou běžně použitelné i pro tenhle čip a uchladí ho tiše i v maximální zátěži! Test verdict: "Pokud tedy máte z nějakého důvodu málo místa tam, kam se snažíte X399 a ThreadRipper nacpat a U14S se vám nevejde, jsou U12S a U9 určitě možnosti. Zejména U9 se vejde do klasických racků a vzhledem k rozměrům docela překvapí, že je vůbec schopna tohle uchladit a stále ještě s přijatelnou nízkou hlučností." (Jan Stach, DDWorld.cz) 12.11.2018 // WhatNext.pl NH-U9 TR4-SP3 Review Nie liczcie tutaj na wysoką wydajność, ale na taką, która zapewni bezproblemowe działanie procesora. Także sama kultura pracy na maksymalnych obrotach mogłaby być lepsza – na mniejszych jest już dobrze. Chłodzenie jest też znakomicie wykonane i posiada prosty montaż czy fajne dodatki. Polecam je dla osób, które składają komputer w mniejszej obudowie i nie mają miejsca dla większych chłodzeń. Wtedy też Noctua NH-U9 TR4-SP3 świetnie się sprawdzi. Test verdict: "Polecam je dla osób, które składają komputer w mniejszej obudowie i nie mają miejsca dla większych chłodzeń. Wtedy też Noctua NH-U9 TR4-SP3 świetnie się sprawdzi." (Michał Andruszkiewicz, WhatNext.pl) 13.06.2018 // FunkyKit.com NH-U9 TR4-SP3 Review There are so few coolers on the market for the Threadripper platform, it’s even easier to say that Noctua is the best air cooling you can find. Depends on the PC and other components we can choose one of the three coolers. The NH-U9 TR4-SP3 is the smallest but also great performing cooler from the TR4 line. It performs well but its high-quality design also helps to keep low noise. I was surprised how well this cooler works comparing to higher models as we are used seeing the best coolers with 120 or 140mm fans while here we have quite small, 92mm fans. Test verdict: "Noctua NH-U9 TR4-SP3 seems the perfect cooler for all users who wish to use top-performing AMD platform and have limited space." (Bartosz Waluk, FunkyKit.com) 05.12.2017 // Guru3D.com NH-U9 TR4-SP3 Review You probably will already have noticed it, but the U12S and U14S managed to cool better than the Kraken X40 LCS cooler, especially the U14S crunches down the cooling numbers. That's impressive, but also wasn't a very likely thing to happen. Here's my thought on that, it's the full cover heat block on the Noctua coolers that draw every Watt of heat they can deal with until they run out of capacity. Even tweaked with 16 cores at 100% stress / 1.38V the U14S managed to stay four degrees cooler compared to that Kraken X40 LCS unit, which is a lot in the cooling arena. Now of course, once you go pro with liquid cooling and bigger radiators, the dynamics will shift. But none-the-less this was very impressive to see. Test verdict: "So there you have it, overall we feel the Noctua U12S and NH-U14S coolers are very nice, the looks are a matter of taste, the performance winner, however, is the NH-U14S TR4/SP3." (Hilbert Hagedoorn, Guru3D.com) 22.09.2017 // Linus Tech Tips NH-U9 TR4-SP3 Review Test verdict: "The Noctua ran a few degrees cooler, so we have to award it the win by technical knockout!" (Linus Sebastian, Linus Tech Tips) 21.09.2017 // TechTesters NH-U9 TR4-SP3 Review Voor wat overclockwerk richting de praktische limiet van de meeste Ryzen CPU’s (3,9-4,0 GHz) lijkt de NH-U14S de meest logische, want die is niet alleen nipt wat koeler op stock speeds maar neemt ook een grotere voorsprong wanneer het voltage omhoog gaat; de NH-U9S loopt met een voltage van 1,3-1,35V duidelijk verder op en een behuizing met degelijke airflow lijkt dan wel het uitgangspunt. Ook met het oog op een nog wat warmere Threadripper 1950X met OC lijkt de NH-U14S wel het pad om te volgen; de andere twee kunnen het zeker ook, maar als de verwachting dan is dat het prijsverschil erg beperkt blijkt tussen de NH-U14S en de NH-U12S terwijl we al over minimaal 1200 euro aan CPU en moederbord praten dan lijkt dat mij eigenlijk geen overweging meer. Aan de andere kant zien we ook voldoende potentie dat een NH-U12S en zelfs de NH-U9S op een 1950X geen problemen gaan hebben als je ze niet hard op hun staart gaat trappen, dus wanneer de hoogte in je case beperkt is is het fijn te weten dat er tenminste twee compactere torens zijn die zo’n CPU wel bijbenen. Wellicht zelfs dat er dan alsnog wat OC ruimte in blijkt te zitten, iets wat ik vooraf als onmogelijk had geschat. Test verdict: "Hoe dan ook, ik ben heel erg positief verrast door alle drie de koelers op deze toch hele dikke CPU. Threadripper bouwers hoeven zich volgens mij geen zorgen te maken met oplossingen als dit tot hun beschikking." (Stephan Overbeeke, TechTesters) 10.05.2019 // Play3r.net NH-U9 TR4-SP3 Review The Noctua NH-U14S TR4-SP3 proves the best of the Noctua based coolers which are expected. The higher performance NF-A15 PWM fan made all the difference and with more weight and a slightly bigger frame, for performance users, the U-14S proves the cream of the crop. For users looking for a lower profile option and don’t perhaps want to overclock a processor such as the AMD Ryzen Threadripper 1950X, the Noctua NH-U9 performs superbly in our testing, dropping around 5-6c from the U-14S which was surprising. The Noctua NH-U12S as expected sits middle of the road and competes pretty well with the bigger U-14S model. Test verdict: "Noctua is famed for their CPU coolers and the NH-D14/D15 are some of the most recognisable on the market. With a more specialist and high-performing socket such as TR4, or the professional SP3 socket, a good quality product is needed." (Paul Davies, Play3r.net) See all 41 reviews for this product NA-FC1 Compact, highly flexible controller for 4-pin PWM fans NA-SEC1 4-Pin Extension Cables You can either buy from our local sales partners or directly from us via our official Amazon and eBay stores: Amazon.comAmazon.caAmazon.co.ukAmazon.deAmazon.esAmazon.frAmazon.itAs an Amazon Associate, we earn from qualifying purchases. eBay.com eBay.de INSTRUCTIONS AND INFORMATION SHEETS (PDF) FAQs MAINBOARD COMPATIBILITY CASE COMPATIBILITY CPU COMPATIBILITY Installation Manual (PDF) Information Sheet (PDF) FAQs After some time of prolonged full load, the CPU clock starts to drop off to very low values intermittently, is the cooler insufficient? How can I determine if the motherboard’s UEFI BIOS is overclocking my processor by default and deactivate this automatic overclocking? Which Noctua fan or CPU cooler should I buy? How to choose the right model? How much torque should be applied when tightening the screws of a Noctua CPU cooler? I have difficulties installing the cooler, can you help? My case supports CPU coolers of up to XXXmm height, which model should I choose? I'm experiencing fan speed issues with my motherboard from Supermicro, what can I do? Can I install a Noctua cooler in my system from Acer, Dell, HP or Lenovo? What Thermal Design Power (TDP) is this cooler recommended for and how much Watt (W) of heat can it dissipate? Which sockets are supported or can be supported using upgrade kits? How should I clean my Noctua cooler? Can I upgrade my existing Noctua cooler to socket TR4 or SP3? Which Noctua coolers are compatible with Ryzen Threadripper 2? Even with a high-end cooler, the performance is not what I would expect, what can I do? Is it possible to use the cooler with vertical graphic cards? After some time of prolonged full load, the CPU clock starts to drop off to very low values intermittently, is the cooler insufficient? This behavior is usually due to overheating of the voltage regulation module (VRM), which provides the CPU with power. To stay within a defined temperature threshold (defined by the component and motherboard vendor) and to cool down the VRM, the clock speed of the CPU might be reduced to very low values. When the temperature of the VRM is back within a safe range, the CPU clocks will be increased back to the expected values until the temperature limit is reached again. Internal tests at Noctua have shown that not all motherboards on the market are able to power the 250W models at prolonged full CPU load without the VRM running into thermal throttling. In case you experience the behavior described above please, check the VRM temperature (e.g. via HWinfo) and provide additional cooling to this area. In doubt, please contact your motherboard manufacturer for further information. How can I determine if the motherboard’s UEFI BIOS is overclocking my processor by default and deactivate this automatic overclocking? Most motherboard vendors allow their overclocking-enabled products (e.g. those with Intels X- or Z-series chipsets) to run the processor at increased clock speeds by default, without requiring any user action at all. Since TDP (Thermal Design Power) limits are usually also disabled by default, this leads to the CPU exceeding the rated TDP to a varying degree, depending on the used applications and their workloads. Due to the increased heat output of the CPU, you may see higher CPU temperatures than expected. In order to find out if your motherboard is overclocking your processor by default, please enter the UEFI BIOS and select the “advanced” or “overclocking” menu. There you should be able to find options such as “MultiCore Enhancement” (options: enabled/disabled), “CPU Ratio Apply Mode” (options: all/per core) or similar. To disable the automatic overclocking, adjust the settings either to “disabled” or “per core” and make sure that the individual multipliers match the original specifications. In doubt, please contact your motherboard vendor for detailed instructions on how to disable this feature. Which Noctua fan or CPU cooler should I buy? How to choose the right model? Not sure which Noctua product to buy? Our detailed buying guides for fans and CPU coolers help you to choose the model that works best for you. How much torque should be applied when tightening the screws of a Noctua CPU cooler? All screws should be tightened gently until they stop without using excessive force. Please do not exceed the following values for maximum tightening torque: Screw typeMax. torque NM-SSC1 screws for fixing the fastening brackets to the base of the heatsink0.5 Nm NM-ITS1 thumb screws for fixing Intel mounting bars0.5 Nm NM-ALS1 screws for fixing AMD mounting bars0.6 Nm Spring-loaded screws for fixing the heatsink to the mounting bars0.6 Nm I have difficulties installing the cooler, can you help? Please refer to the installation manual and our video installation guides for detailed instructions on how to install the cooler. My case supports CPU coolers of up to XXXmm height, which model should I choose? Please refer to our TDP guide in order to select the cooler that offers the best cooling performance at a given height. I'm experiencing fan speed issues with my motherboard from Supermicro, what can I do? The BIOS of many motherboard models from Supermicro expects a certain minimum fan speed (usually 600 or 700rpm), which is higher than the minimum fan speed that can be achieved with Noctua's PWM fan models. The BIOS may interpret the low minimum RPM of Noctua fans as a fan error and thus try to run the fan at 100% for a short period before going back to automatic control. This can result in oscillating fan speeds and fan speed warnings in the BIOS or the fan management console. Unfortunately there is usually no option to set a lower minimum value in the BIOS that would suit the low minimum speed of Noctua PWM fans. The issue can thus only be resolved by either disabling automatic fan speed control in BIOS, which will cause the fans to run at a constant speed, by using 3rd party tools like IPMItool or IPMIutil, or by requesting a modified BIOS file from Supermicro, which takes the minimum fan speed of Noctua fans into account (charges might apply). Please note that any modifications performed with 3rd party tools are done at your own risk and that Noctua can not be held responsible for any possible issues. Can I install a Noctua cooler in my system from Acer, Dell, HP or Lenovo? Systems from Acer, Apple, Dell, HP, Lenovo or other major brands often use motherboards which differ slightly from the specifications issued by Intel and AMD. While those changes are usually subtle, they can lead to compatibility issues with coolers that were built to comply with these specifications. Even in case the cooler is mechanically compatible and can be installed, other issues can occur, e.g. proprietary fan connectors, BIOS errors due to a low fan speed, shutdowns, etc. Some of these problems can be avoided with some technical knowledge, but especially BIOS related issues can often not be resolved. Due to the large number of possible issues that cannot be resolved with different mounting parts alone, Noctua does not officially support systems from Acer, Apple, Dell, HP, Lenovo or other major brands. What Thermal Design Power (TDP) is this cooler recommended for and how much Watt (W) of heat can it dissipate? Please refer to our CPU compatibility list for information on maximum recommended TDP and heat dissipation. Which sockets are supported or can be supported using upgrade kits? Please refer to our socket compatibility chart. How should I clean my Noctua cooler? Dust: Fans and heatsinks inside computer cases tend to accumulate dust over longer periods of usage. In order to maintain maximum performance, please clean your fan and heatsink regularly. For cleaning, please first remove the fan from the heatsink and clean it using a duster, slightly moist tissue or canned air. Please be careful not to use too much force in order to prevent any damage to the fan. Please do not use a vacuum cleaner as this may apply excessive force to the fan and do not put the fan under running water as water residues inside the motor may lead to short circuits. Please also note that the fan is not designed to be taken apart by the user. Removing the impeller from the frame will break the sealing of the bearing and results in a loss of warranty. Before reinstalling the fan, clean the heatsink itself with a duster or vacuum cleaner. Do not use water to clean the cooler. Finally put the fan back on and connect it to your motherboard fan header or fan controller. Thermal paste residues: Whenever you take off the heatsink from the CPU, we recommend to clean the CPU as well as the base of the cooler before re-applying thermal paste and re-installing the cooler. You can either just wipe the base and the CPU clean with a dry, lint-free tissue or, for more thorough cleaning, use a lint-free tissue moistened with either a mild solution of washing-up liquid or isopropyl alcohol. Do not put the cooler or CPU under running water. Note that both the base of the heatsink and the CPU should be dry, free from residues of thermal compound and free from grease before re-applying thermal paste and re-installing the cooler. Can I upgrade my existing Noctua cooler to socket TR4 or SP3? Unfortunately, it is not possible to upgrade existing Noctua heatsinks to support the AMD TR4 and SP3 sockets for Ryzen Threadripper (X399) and Epyc CPUs. TR4/SP3 CPUs have much bigger heatspreaders (as compared to e.g. LGA2066 or AM4 processors) and the contact surfaces of standard Noctua heatsinks would cover only about half of these heatspreaders, which would result in insufficient cooling performance. On top of that, the heatpipes of bigger cooler models like the NH-D15 or NH-D15S would completely block the RAM slots on many TR4/SP3 motherboards. For this reason, Noctua has introduced the new NH-U14S TR4-SP3, NH-U12S TR4-SP3 and NH-U9 TR4-SP3 cooler models that feature bigger contact surfaces and have been tailored to fit TR4 and SP3 systems. Please choose these models for AMD Ryzen Threadripper and Epyc systems. Which Noctua coolers are compatible with Ryzen Threadripper 2? Please see our TDP guidelines for details. Even with a high-end cooler, the performance is not what I would expect, what can I do? First of all, please note that results in reviews might show different results as many tests are conducted in open test bench configurations outside a chassis, which allows a better supply of fresh air and thus allows the coolers reach lower temperatures than in a real-world setup inside a chassis. Secondly, processors emitting heat-loads of 180-250W or even more (with Turbo Boost) create more challenges for case ventilation than lower power mainstream CPUs as it is very difficult to remove so much heat from the chassis. For best performance, it is crucial that sufficient amounts of fresh air can enter the chassis and that warm air leaves the chassis as fast as possible. Internal testing at Noctua has shown that many PC cases are rather restrictive when it comes to air intake and exhaust due to dampening materials, doors, covers or a rather closed design approach in general. Increasing the number of system fans can help to a certain degree but will not provide much improvement if intakes and outlets are too resistive. The best cooling results are to be expected from cases which use a rather open approach (e.g. mesh walls and intakes). Unfortunately, Noctua cannot provide detailed recommendations for individual system configurations as there are too many options and variables available to give general recommendations. Please refer to general case cooling guidelines such as this one for information how to setup the airflow inside your case. Is it possible to use the cooler with vertical graphic cards? Depending on the chassis, card and motherboard being used, installing PCIe cards in a vertical position using riser cards may cause compatibility issues with CPU coolers. Whether there will be a problem or not depends on the exact position of the card (which is determined by the PC case and/or optional vertical GPU holder bracket), the width of the card as well as the position of the CPU socket on the motherboard. In order to verify that there is sufficient space for the cooler, please measure the distance between the centre of the CPU socket and the top of the PCI card in order to make sure that the cooler fits. Do you have a question concerning one of our products? Please use this form to pose a question! Disclaimer:We create and update our compatibility lists with the utmost care. Unfortunately, mainboard manufacturers tend to change certain components and heatsinks without pointing it out by using corresponding revision names. If you run into problems while installing our coolers on one of the mainboards listed as being compatible, please don't hesitate to contact our support team at firstname.lastname@example.org.Please also keep in mind that other components such as narrow or small cases as well as memory modules with special (higher) heat-spreaders can cause compatibility-issues.For use in systems from Dell, HP or Lenovo, please note this FAQ. Our case compatibility list helps you to quickly identify which PC cases offer sufficient clearance for which Noctua CPU coolers. The compatibility indication is based on the height of the coolers (including fans) as well as the maximum CPU cooler height specification given by the chassis manufacturer. Caution: Please note that the fans of some tower coolers (especially larger models with 140mm fans, e.g. NH-D15 or NH-U14S TR4-SP3) may overhang the RAM slots and that this can cause compatibility issues if RAM modules taller than 32mm are used. While the fans can be moved upwards to increase RAM clearance, this will increase the total height of the cooler and thus requires additional clearance inside the chassis. As a rule of thumb, if the fan overhangs the RAM, the maximum CPU cooler height specification of the case must be at least the size of the fan plus the height of the RAM minus 7mm (accounting for the height of the socket and CPU). For example, if a cooler uses a 140mm fan that overhangs the RAM and 46mm tall RAM modules are used, the max. CPU cooler height specification should be at least 179mm (140+46-7=179). For further information and instructions on how to move up the fan for each cooler model, please click the height specification link. Disclaimer: We create and update our compatibility lists with utmost care. However, case manufacturers sometimes change parts or details of their products without prior notice or explicitly indicating a revision. Therefore, Noctua cannot accept any liability, nor in any other way be held responsible, for the following compatibility information. When modern CPUs use their turbo modes, they can (depending on the configuration of the UEFI BIOS) dissipate much more heat than indicated by the manufacturer’s TDP (Thermal Design Power) specification. Just like manual overclocking, this puts higher demands on the cooling solution. Our CPU compatibility list helps you to choose the cooler model that is best suited for a given CPU and your individual requirements as far as turbo and overclocking headroom are concerned. We classify our coolers according to the following categories: best turbo/overclocking headroom medium turbo/overclocking headroom low turbo/overclocking headroom compatible without turbo/overclocking headroom compatible with certain restrictions (see comment) incompatible (see comment) For further information on CPUs exceeding their TDP ratings and how to configure the UEFI BIOS in order to avoid excessively high temperatures, please see this FAQ. Please also see our general buying guide, motherboard compatibility list and FAQs for further help on how to select the best cooler for your configuration.