For most small form factor builds, the Noctua NH-L9x65 chromax.Black is the best low profile CPU cooler in this group: it is 65 mm tall including the fan, its footprint stays clear of memory slots, and it is built for quiet running with a 65-watt class processor. If you need the lowest possible height or want to cool a hotter chip, the Thermalright AXP90-X53 family (53 mm) and the 120 mm AXP120-X67 cover those jobs. A low profile cooler is one short enough, usually under about 70 mm with the fan, to fit a slim or mini-ITX case.
Our Top Picks
Thermalright AXP-90 X53 Black Low Profile CPU AirHeight 53mm3.7 x 3.74 x 1.5 inches1 PoundsCheck on Amazon
Thermalright AXP90-X53 White Low Profile ITX CPU Air53mm3.72 x 3.74 x 2.09 inches1 poundsCheck on Amazon
Thermalright AXP90-X53 Full Cooper Low Profile CPU Cooler3.72 x 2.09 x 3.74 inches0.2 poundsCheck on Amazon
Top 3 picks at a glance
Quick List
- Thermalright AXP-90 X53 Black – best for the lowest height with a proven 92 mm top-flow layout
- be quiet! Pure Rock Low Profile – best for quiet, modest-wattage builds in very short cases
- Noctua NH-L9x65 chromax.Black – best overall for quiet SFF builds with a 65 W class chip
- Thermalright AXP120-X67 – best for a larger 120 mm fan and six heat pipes where height allows 67 mm
- Thermalright AXP90-X53 White – best for a white-themed 53 mm build
- Thermalright AXP90-X53 Full Copper – best for builders who want a copper-fin version of the same 53 mm design
Which One Is Right for You?
| If you… | Choose |
|---|---|
| build a quiet mini-ITX living room PC with a modest processor | Noctua NH-L9x65 chromax.Black |
| have room for 67 mm and want the biggest fan in the group | Thermalright AXP120-X67 |
| need to stay at 45 mm and run a low-wattage chip | be quiet! Pure Rock Low Profile |
| need 53 mm with the black finish | Thermalright AXP-90 X53 Black |
| match a white case or board | Thermalright AXP90-X53 White |
| want a heavier all-copper version of the 53 mm design | Thermalright AXP90-X53 Full Copper |
Measure your case's cooler height limit first, then decide how much heat the processor will produce. Short coolers trade cooling capacity for height, so the best fit is the tallest cooler your case allows paired with a processor that does not need more than the cooler can handle. Check memory height too, because a few of these coolers overhang the first DIMM slot.
All 6 Picks in Detail
1. Thermalright AXP-90 X53 Black – Best for the lowest height with a 92 mm fan
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The AXP-90 X53 is a top-flow air cooler with four heat pipes, a 92 mm slim PWM fan and a 53 mm overall height. It suits builders who need a short cooler for a slim case and want broad socket support, including LGA 1700 and AMD AM4 and AM5. The fan sits on top, so memory height is rarely a problem, and the cooler blows air down onto the motherboard to help cool the voltage regulators.
- Total height of 53 mm: about 38 mm of heatsink plus a 15 mm fan
- Four 6 mm copper heat pipes with a nickel-plated copper base
- 92 mm slim PWM fan, rated around 2700 RPM in published specifications for the family
- Supports AMD AM4 and AM5 and Intel LGA 1700 and several older sockets (confirm your socket on the listing)
- Top-flow design that cools the area around the socket
- Weighs roughly 300 g for the heatsink in published specifications
Pros:
- Very short for the cooling capacity
- Broad socket compatibility
Cons:
- Fan can get audible at its top speed
- Not meant for the hottest unlocked processors
Compared with the Pure Rock Low Profile, it is a bit taller but typically offers more headroom; against the Noctua, it is shorter but gives up the quiet tuning that Noctua sells.
Who should skip it: anyone with a processor that draws well above 100 watts under sustained load, or builders who want near-silent running at all times. Everyone else gets a compact, proven design that is easy to fit and easy to find in several finishes.
2. be quiet! Pure Rock Low Profile – Best for quiet, modest-wattage builds
The Pure Rock Low Profile is a small top-flow cooler rated by the maker for 100 W of heat. It has three 6 mm heat pipes and a 92 mm PWM fan, and it is meant for compact cases that cannot take a taller tower. It suits builders who run a mainstream processor in a slim case and want a cooler from a well-known brand that is easy to install.
- Rated for a 100 W thermal design power by the manufacturer
- Three 6 mm heat pipes and an aluminum fin stack with a copper base
- 92 mm PWM fan; published noise ranges from roughly 13 dB(A) at low speed to about 31 dB(A) at full speed
- Total height of about 45 mm with the fan, per the manufacturer
- Supports Intel LGA 1700 and several older Intel sockets, plus AMD AM4 and AM5
- Weighs about 358 g with the fan, per published specifications
Pros:
- Lowest overall height in the group
- Quiet at low and medium speeds
Cons:
- Limited capacity for high-wattage processors
- Fan is audible at full speed
It is the shortest of the six, and the closest alternative for a slightly taller case is the Noctua NH-L9x65.
Who should skip it: anyone with a Core i7, i9 or a Ryzen chip that pulls well over 100 watts, because the cooler will run the fan hard and the processor may throttle. Pair it with a 65 W class processor and a sensible fan curve for the best result.
3. Noctua NH-L9x65 chromax.Black – Best overall for quiet SFF builds
The NH-L9x65 is a 65 mm tall cooler with four 6 mm heat pipes and a 92 mm NF-A9x14 PWM fan. Its footprint is about 95 mm by 95 mm, so it does not overhang memory slots or the first PCIe slot on typical mini-ITX boards. It suits quiet builders who want a premium cooler for a 65 W class processor in a mini-ITX case, and it is the one most aimed at low noise rather than peak cooling.
- Total height of 65 mm with the fan; 51 mm without the fan
- Four 6 mm heat pipes with copper base and aluminum fins
- 92 mm NF-A9x14 PWM fan with a maximum speed of 2500 RPM
- Low-noise adaptor included to cap the fan near 1800 RPM
- Footprint of about 95 by 95 mm, with no overhang over memory on supported boards
- Supports Intel LGA 1700 and 1851 plus AMD AM4 and AM5
Pros:
- Quiet, with RAM and PCIe clearance
- Long warranty and a mounting kit that includes paste
Cons:
- Capacity suits modest processors, not hot ones
- Needs 65 mm of height
Against the Thermalright AXP120-X67, it is shorter and more compact, but the larger Thermalright unit offers more fin area.
Who should skip it: anyone with a case limit under 65 mm, or a builder who wants to push an overclocked chip. Everyone else, especially owners of living room and media PCs, will find it a calm, easy cooler that keeps its manners under light and moderate loads.
4. Thermalright AXP120-X67 – Best for a 120 mm fan and six heat pipes
The AXP120-X67 pairs a 120 mm slim PWM fan with six heat pipes in a 67 mm tall package. It suits builders who have a little more vertical room and want the most cooling in a low profile format. The larger fan can move more air at a lower speed, which helps with noise, while six heat pipes carry heat more effectively than the four on the 92 mm models.
- Total height of 67 mm: about 52 mm of heatsink plus a 15 mm fan
- Six 6 mm heat pipes with a nickel-plated copper base
- 120 mm TL-C12015 PWM fan, rated around 1800 RPM in published specifications
- Footprint of roughly 120 by 123.5 mm, so check clearance around memory and expansion slots
- Weighs roughly 490 g in published specifications
- Supports AMD AM4 and AM5 and Intel LGA 1700 and several other sockets (confirm your socket on the listing)
Pros:
- More cooling capacity than the 92 mm models
- Large fan can run slower and quieter
Cons:
- Wider footprint demands more case and board clearance
- Heavier than the other coolers
It is the largest option here, and the Noctua NH-L9x65 is the nearest alternative if you prefer a smaller footprint and quieter tuning.
Who should skip it: builders in cases that cap cooler height at 65 mm or less, or boards with tightly spaced memory slots. If you have the room, though, this is the one that handles a hotter chip with less noise.
5. Thermalright AXP90-X53 White – Best for a white-themed 53 mm build
The White version of the AXP90-X53 carries the same 53 mm layout as the black model and adds a finish that suits white cases and boards. The listing states a 92 mm slim PWM fan, a noise rating of 22.4 dB(A) and a 2700 RPM top speed. It suits builders who want a short top-flow cooler that blends with a light-colored build.
- 53 mm overall height with a 92 mm slim fan
- Four heat pipes and a copper base (confirm exact construction on the listing)
- Fan rated at 22.4 dB(A) and 2700 RPM in the listing
- White finish for matching light builds
- Supports several AMD and Intel sockets, including AM5 and LGA 1700 per the listing
- Top-flow design that moves air over the board around the socket
Pros:
- Short height and white finish
- Same proven layout as the black model
Cons:
- Fan speed can be noticeable under load
- Capacity is similar to the black version, not greater
The nearest alternative is the black AXP-90 X53, which is the same cooler in a different finish.
Who should skip it: builders who do not care about color; the black version covers the same ground. If appearance is not a priority, choose by price and availability among the two finishes.
6. Thermalright AXP90-X53 Full Copper – Best for a copper-fin version of the same design
The Full Copper version keeps the 53 mm height and 92 mm fan but uses copper for the fins as well as the base and heat pipes. Published reports describe it as noticeably heavier than the aluminum version, roughly 540 g without the fan against about 300 g for the standard heatsink. It suits builders who want a little extra heat spreading capacity and do not mind the extra weight in a small case.
- 53 mm overall height with a 92 mm slim PWM fan (listed as TL-9015R)
- Copper fins and base, with AGHP heat pipes per the listing
- Heavier than the aluminum-fin versions, so secure mounting matters
- Supports several AMD and Intel sockets (confirm your socket on the listing)
- Top-flow design with a minimal footprint
- Fan speed and noise figures: confirm on the listing
Pros:
- Copper fins add thermal mass and spreading
- Same compact footprint as the other X53 models
Cons:
- Heavier than the aluminum versions
- The fan is the same size, so the noise profile is similar
It sits closest to the black AXP-90 X53, and the choice between them comes down to your appetite for extra weight.
Who should skip it: anyone who plans to move a small case frequently, because a heavier cooler puts more stress on the board during transport. Otherwise it is a fine option for a stationary SFF desktop.
Specs Compared
| Cooler | Height | Fan | Heat pipes | Stated capacity or note | Fin material |
|---|---|---|---|---|---|
| Thermalright AXP-90 X53 Black | 53 mm | 92 mm slim PWM | 4 | Confirm on listing | Aluminum fins (confirm on listing) |
| be quiet! Pure Rock Low Profile | About 45 mm | 92 mm PWM | 3 | 100 W TDP per the manufacturer | Aluminum fins |
| Noctua NH-L9x65 chromax.Black | 65 mm | 92 mm NF-A9x14 PWM | 4 | Quiet use with 65 W class chips per the manufacturer | Aluminum fins |
| Thermalright AXP120-X67 | 67 mm | 120 mm slim PWM | 6 | Confirm on listing | Aluminum fins (confirm on listing) |
| Thermalright AXP90-X53 White | 53 mm | 92 mm slim PWM, 2700 RPM | Confirm on listing | Confirm on listing | Confirm on listing |
| Thermalright AXP90-X53 Full Copper | 53 mm | 92 mm slim PWM | Confirm on listing | Confirm on listing | Copper |
How We Chose These
This guide is built from desk research. We started with the six coolers that were provided, then compared each against published manufacturer specifications and retailer listing fields. We weighed total height, fan size and noise ratings, heat pipe count, stated thermal capacity, socket support, memory clearance and weight. We did not rank by price, and we did not run any cooling measurements ourselves, so capacity figures are manufacturer ratings, not our own results. Where listing titles and manufacturer pages disagree or leave a value blank, we mark it as something to confirm on the product page.
What to Look For
Case height limit
The first number to check is the maximum CPU cooler height in your case specifications. Low profile cases for mini-ITX or slim desktops often cap height at 55 mm, 65 mm or 70 mm. Choose a cooler at least a few millimeters below that limit, because side panels flex and fans may need breathing room. A 53 mm cooler fits most slim cases, while a 67 mm unit needs a case that says it can take it.
Thermal capacity and the processor you pair with it
Cooler ratings are not standardized, so treat a stated TDP as a rough guide. A 65 W class processor, such as many Core i5 and Ryzen 5 chips at stock settings, suits all six coolers. A chip that can draw 125 W or more under load needs a larger heatsink than a 45 to 67 mm cooler can provide, or you must limit its power in the BIOS. Lowering power limits is a common way to keep a small build quiet.
Fan size, speed and noise
Smaller fans must spin faster to move the same air, so 92 mm fans at 2500 RPM or more are louder than a 120 mm fan at 1800 RPM. Noise ratings in the listing are measured at maximum speed. In practice, a sensible fan curve keeps most SFF builds well below the maximum. Choose PWM fans with a four-pin connector so the board can control speed.
Memory and expansion clearance
Top-flow coolers sit above the CPU and generally do not overhang memory, but a wide footprint such as the 120 mm AXP120-X67 can reach the first DIMM slot or the graphics card area. Check the cooler's footprint against your board layout, especially with tall memory heat spreaders. On mini-ITX boards, the first PCIe slot is close to the socket, so a fan that sits low is a plus.
Mounting and installation
Low profile coolers use backplates or clip brackets that differ by socket, and the right hardware is usually in the box. Before installing, check that the board backside has room for a backplate, particularly in mini-ITX cases where the tray sits close. Apply a small dot of paste, tighten the screws in an X pattern a little at a time and plug the fan into the CPU fan header rather than a case fan header. A heavy copper cooler benefits from careful, even tightening and a case that stays level during moves.
Airflow in a small case
A top-flow cooler pushes air down onto the board, so the case needs somewhere for that air to leave. Side vents, a rear exhaust fan or a mesh panel above the cooler all help. In a sealed slim case, even a good cooler can run warm because the air recirculates. If your case has a fan mount above the cooler, use it as exhaust.
Worked example
Imagine a mini-ITX case with a 65 mm cooler limit and a Core i5 locked chip. The Noctua NH-L9x65 fits at 65 mm, but if the real limit is 64 mm, step down to a 53 mm Thermalright. If the processor is closer to 100 W under load, the be quiet! cooler is rated for it but runs its fan harder, while the AXP120-X67 would be the better choice if the case could take 67 mm.
Questions
Can a low profile cooler handle a Core i7 or Ryzen 7?
It can if you keep power limits modest. Most low profile coolers are comfortable with 65 W class chips, and a few handle more, but the fan will run harder and the processor may throttle under sustained loads.
Is a bigger fan always better?
A 120 mm fan can move the same air as a 92 mm fan at a lower speed, which usually means less noise. The trade-off is the larger footprint and height, so check your case first.
Do I need thermal paste?
Most coolers include paste, and the listings for several of these note it. A pea-sized dot in the center of the processor is enough, and old paste should be wiped away if you are reusing the CPU.
Will these fit AM5 and LGA 1700?
The listings and manufacturer pages mention both. Confirm the exact mounting hardware for your socket on the product page, especially for newer Intel sockets.
Is the Full Copper version worth it?
It adds weight and thermal mass, but the fan and height stay the same. Treat it as an option for builders who value the material rather than a guaranteed temperature gain.
How do I keep a small build quiet?
Limit processor power in the BIOS, use a fan curve with a gentle slope and keep dust filters clean. A cooler with a low-noise adaptor or a larger fan helps too.
Update History
- October 14, 2026 – Initial publication; product set drawn from current catalog listings.
- Check the product page for current specifications and availability before buying.
Sources
- Manufacturer product and specification pages for Thermalright, be quiet! and Noctua
- Retailer listing titles and specification fields for all six coolers
- Published product write-ups of the AXP90-X53 and AXP120-X67 coolers
