Aircooling Cooling Fans Practice Reviews

Fan assembly in a case with overpressure concept – How many fans do you actually need where? | Short test

Out of pure personal interest I once did a little fan experiment in my own system. Cases like the Lian Li O11 Dynamic / XL, Inter-Tech C701-Panorama, MetallicGear NEO Qube and other O11 clones (although the O11 was not the first multi-chamber case) offer partly up to 9 case fans or more space. Optically similar cases such as the Antec P120 Crystal also use the most popular case layout of the past year and hold an impressive number of fans. But is it really worth it to take a whole bunch of money in your hand again to really occupy all the seats?

This is exactly the question I asked myself and just tried all the fun! Since I prefer positive pressure in the case (overpressure) to have as little dust in the case as possible, the case fans are built in as an inlet and the AiO fans blow out the warm air. The housing fans are mounted in the lid and base, the AiO water cooling is mounted on the side. As case I use the Inter-Tech C-701 Panorama, so there is enough space for installation:

My personal system looks like this:

  • AMD Ryzen 9 3900X (12 cores / 24 threads)
  • Fractal Design Celsius+ S36 Prism 360mm AiO
  • Gainward RTX 2080 Pheonix
  • Inter-Tech C-701 Panorama
  • Besides the 3 pre-installed 120mm fans from AiO, I use up to 6 additional 120mm fans from Noctua, the popular NF-S12A PWM in the new version.

For the stress test I use the MSI Kombustor (version The CPU Burner runs on 12 threads, as GPU stress test (GL) msi-01 GPU stress test @ 720p. With HWInfo (Version 6.26-4160) the temperatures are recorded, 5 minutes each for warming up, then 15 minutes both stress tests. The pump works at 100%, all fans at 70% RPM and the graphics card at 75% RPM. In the end I came to the following results:



Who would have thought it: More fans provide better cooling performance or And indeed, a difference between 4 to 6 intake fans can be measured. A further advantage of many fans is of course additionally that with a lower speed and thus volume, the same air flow can be achieved as with fewer fans at higher speed – and in addition there is literally “air up”.


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