The Best Fanless CPU Cooler Showdown

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What is the best fanless CPU cooler? I did a direct comparison of the four most widely available fanless CPU coolers. Included were the Arctic Alpine 12 Passive, NoFan CR-80EH, SilverStone HE02, and the NoFan CR-95C. I tested the four coolers in the same system at various power levels to see how each cooler does under the same conditions. Two different CPUs were used, the Intel i5-9400 and the i9-9900. I fired up Windows 10 and ran Prime95’s torture test with small FFTs for half an hour during each run. The test system included an ASRock H370 Pro4 motherboard installed in a Fractal Design Meshify C case. The case was stripped down, all fans, drive bays, and dust filters removed for optimal natural passive airflow.
Linear trendlines were added to the data, and formulas for stressed core temperatures were determined. If we use these formulas to calculate the theoretical maximum CPU power uses for each cooler, assuming an ambient room temperature of 25 degrees Celsius and maximum core temperatures of 100 degrees, we get 58 watts for the Arctic Alpine 12, 81 watts for the NoFan CR-80EH, 113 watts for the SilverStone HE02, and 126 watts for the NoFan CR-95C.
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