40 W Heat-Load (HTPC / Office PCs)

40 W Heat-Load (HTPC / Office PCs)

Test Details:

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To test the CPU cooling units we use the der8auer-Test-Bench. It has been modified with a Intel Core i7 4770K Heatspreader on the contact surface. The contact surface itself has been cut down to the shape of a 4770K DIE. This will make sure that the test bench creates heat load similar to a normal CPU and the results are equal to a normal test.


We use the Thermal Grizzly Kryonaut thermal paste for all coolers to make sure the thermal paste is not limiting the test results.

Each cooler is mounted 3 times and we measure the temperature difference between the ambient temperature and the temperature of the heat-base. This means that a lower temperature-difference (dT) equals a better performance.

In addition we measure the sound-level of all coolers in 30 cm distance.

All tests are done at 3 different fan speeds. 5 Volt, 7 Volt and 12 Volt.


Result-Table Explanation:

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The result-table is fully sortable. Simply click on a category of the header such as Vendor or Height.

If you click on the Product in the table you can view the detailed product review page.

dT @ x V:

Delta Temperature at a given voltage (5, 7 or 12). Lower dT = better

A delta temperature of over 40 Kelvin is not recommended and would cause your CPU to overheat.

dB @ x V:

Sound-Level at a given voltage (5,7 or 12) in dB. Lower dB = better

<30 dB: unhearable
30-35 dB: very silent
35-40 dB: silent
40-45 dB: hearable
45-50 dB: distinctly hearable
>50 dB: annoying

Height (mm):

The total hight of the cooler measured in mm.


40 W Heat Load Test results (HTPC / Office PC)

VendorProductdT 12VdB 12VdT 7VdB 7VdT 5VdB 5VHeight (mm)
NoctuaNH-U12S (2 x fan)4.1443.34.4239.94.8635.8158
NoctuaNH-U9S (2 x fan)5.3346.95.7741.16.4136.6125
AkasaNero LX7.7948.48.9939.610.0934.459
GELID SolutionsSiberian PRO9.9639.411.0434.212.6030.589
GELID SolutionsSlim Silence i-Plus14.1644.216.0437.818.7132.628
GELID SolutionsSiberian15.4538.017.2833.919.8631.166