ThermalRight AXP-100 review

A low-profile cooler with some tower coolers in its sights

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  • Six heatpipe design
  • Small form factor perfect for HTPC builds
  • Good cooling performance at load


  • Not one for overclocking

The current crop of mini-ITX mobos, with their full-spec desktop chipsets, are just the job for building a powerful HTPC. There's a multitude of small, compact cases around to build them into, but there is a snag - how do you keep the CPU cool in a confined space?

Nine times out of 10 this means using a tower CPU cooler, which is great for keeping a CPU chilled, but not so good if you want to use as small a case as possible. Enter Thermalright and its AXP-100 compact top cooler.

Despite its mere 58mm height (including fan), it manages to cram six - yes, six - 6mm heatpipes into its design. Its compact footprint fits inside the diameter of a 140mm fan, and it supports AMD AM2/ AM3 and FM1 sockets and Intel CPUs from Socket LGA 775 up to (somewhat surprisingly) Socket LGA 2011.

The six heatpipes run through the middle of the nickel-coated copper contact plate and up through the multi-finned aluminium heatsink, where they terminate.

Installing the AXP-100 isn't quite as easy as the Noctua NH-L9i (how can you get any easier than just four screws?), but it only takes a few minutes to get it on the board. Once again, this is another cooler that needs to be mounted on the board before it goes anywhere near the case, as it uses a motherboard backing plate. You could install it in situ if you've got a chassis with a large cut-out behind the mobo, but given that it's likely to be jammed into a small form factor chassis, that's unlikely.

Before you start installing the cooler, the fan needs to come off to enable the cooler to be screwed to the mounting plate via two openings in the heatsink array. Hats off to Thermalright for the way the fan is mounted to the cooler. Instead of rubber mounts, bits of plastic or patience-sapping sprung wire setups, the fan for the AXP-100 uses four screws - simple, but very effective.

Compact chiller

The AXP-100 doesn't make a bad fist of keeping stock speed CPUs cool. Using it on our test i7 3770K, it kept the CPU temperature to a reasonable 35°C. That's not quite as cool as some of the tower coolers we've tested, but when the CPU was pushed to 100 per cent the AXP-100 actually cooled better than some chunkier models. That came as a welcome surprise - generally tower coolers comfortably out perform their top-cooled brethren.


Idle CPU performance
3770K @ 3.5GHz: Degrees centigrade: Lower is better


100% CPU performance
3770K @ 3.5GHz: Degrees centigrade: Lower is better


Peak to idle performance
3770K @ 3.5GHz: Seconds: Faster is better


Inevitably, that flipped around with the processor overclocked. The AXP-100 managed to get within a few degrees of a bunch of tower coolers in idle mode, but when it came to running the overclocked CPU at 100 per cent, the AXP-100 cried foul, shot to over 100°C within a minute, and the testing had to be halted for the sake of our poor stressed-out silicon.

To see a cooler as compact as this using a six-heatpipe design is quite an eye-opener. It works well at stock speeds and is very quiet. It's also small enough in profile to be fitted in some very compact places, and while it isn't one for the overclocking brigade (it just can't handle it), if you're building a compact HTPC system, this excellent little cooler should be at the top of your build list.

Tech Specs

Product TypeCooling Fan/Heatsink
Number of Fans1
Compatible Processor SocketSocket R LGA-2011, Socket B LGA-1366, Socket T LGA-775, Socket FM1, Socket AM3 PGA-941, Socket AM2 PGA-940, Socket H LGA-1156, Socket H3 LGA-1150, Socket H2 LGA-1155
Fan Speed1 x 2500 rpm
Brand NameThermalright
Air Flow1 x 44.5 CFM
Fan Diameter1 x 120 mm
Heatsink Height44 mm
Heatsink Width105 mm
Heatsink Depth121 mm
Height58 mm
ManufacturerThermalright, Inc
Product ModelAXP-100
Product NameAXP-100 Cooling Fan/Heatsink
Manufacturer Part NumberAXP-100
Manufacturer Website Address
Marketing InformationWe know that cooler choice has long been a headache for ITX and HTPC system builders. Stock CPU heatsinks and coolers are hot and noisy, while high quality coolers usually either don't fit the case or interferes with your GPU. So finding the perfect balance of size, thermal performance and noise on ITX and HTPC systems has never been easy, until now!
The Thermalright AXP-100 is here! This latest creation by Thermalright is only a mere 58mm (2.28 inches) in height including the bundled TY-100 high performance PWM fan. This height provides almost full compatibility with HTPC and ITX cases on the market. will also be displaying a full list of case compatibility on our product page.
MaterialCopper Base
Weight (Approximate)360 g