Well I tested with my 140mm c14s and 92mm noctua in the back and found intake on both to be roughly 5-10 degrees better depending on the testing. Someone else found the opposite, so best is to try yourself. Still nees to test again to verify, but I was pretty sure about my testing (real bench to test real game and higher load cpu).
Got great temps with the undervolt and this set up. I have a stock strix rx 5700xt in it so that's also intake for gpu. But honestly the gpu temps were only 2 degrees better and cpu 5-10 depending on the rear being switch to intake (5 degrees better blowing directly on heatsink).
The Hot air goes out of all the sides this way so I don't think it traps it this way with the ncase. Chipset temps were greatly improved by about 10 degrees with the fresh being blown on the mobo.
I think the psu gets warmer this way, but no way to test it and the fan isnt loud so...
While gaming my undervolt 3700x is 60 degrees on 30-40% fanspeed I believe and my strix is set up for 45% fan speed on 69 degrees. Both undervolted which makes a 10% difference in fan speed.
I followed
@HyperActive advices and I set my C14S 140mm fan to intake mode. I haven't tested the temperatures in exhaust mode, but at least with this configuration the temperatures seems more or less the same than him/her.
- 3700x (@4.0Ghz due to the memory profile to use its 3200Mhz)
- Gigabyte 2070 Super OC
- Psu (Corsair 750W) in ATX position
- Only C14S and the three fans of the GPU as cooling solutions
While playing Deux Ex, I know is not the most demanding game:
CPU temps 60 - 70 (motherboard slightly more than that)
GPU temps 65 - 70
More or less, add/minus a couple of degrees.
The noise is also really good, barely noticeable while playing with the sound, etc. While in desktop the noise is almost inexistence. So, I think I'm not going to add more fans :-). It would reduce temps, but I think the current ones are good enough.