The Best Fanless CPU Cooler Showdown 2

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Included in this round of testing are the Scythe Ninja 5, Raijintek Tisis, Thermalright Le Grand Macho, Phanteks TC14PE, Prolimatech Megahalems, and NoFan CR-95C. I tested the six coolers in two system configurations at various power levels to see how each cooler does under the same sets of conditions. The first configuration included the Intel i7-10700 on an Asus Z490-Creator motherboard. The second included the AMD Ryzen 7 Pro 4750G on an Asus B550-F motherboard. The Fractal Design Meshify C case was used, and was stripped down, all fans, drive bays, and dust filters removed for optimal natural passive airflow. I ran Prime95’s torture test with small FFTs for half an hour during each run. This was done a total of 88 times, running each CPU under each cooler at 10-watt power limit intervals from 10 watts up to the highest power level that each cooler could handle without CPU throttling. I changed CPU power limits quickly between each test so that the coolers lost as little heat as possible. This way I could get to heat saturation more quickly during each run. CPU core temperatures were tracked with HWINFO64, saved as CSV files, and then processed in Excel. I ended up with a summary of average core temperatures for each minute of each stress test.

For each cooler here I used the trendlines to estimate at what power limit I would expect to see core temperatures hit 100 degrees when fully stressed, assuming an ambient room temperature of 25 degrees. For the NoFan cooler this gave me a power limit of 95 watts; exactly what the cooler is marketed for! I’ve added the scaled down results from my previous tests for the SilverStone HE02, NoFan CR-80EH, and Arctic Alpine 12 passive coolers. The five new coolers tested all happen to fit in between the NoFan CR-80EH and SilverStone HE02 in performance.

If you are considering a fanless CPU cooler to help silence a standard tower style PC system, I hope these results are useful. Keep in mind that the case chosen and room temperature will have a significant effect on CPU temperatures. I am eagerly awaiting Noctua’s pending passive CPU cooler, which is on their roadmap for release in the first quarter of 2021. Let me know if there is another cooler that you would like to see me test passively in a third passive cooler showdown.

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