Coldsnap said:
Ah, that makes sense. Is there good programs that will control the speeds for you? Like if X programs are on run the fans ect.
For the GPU yes. But most good CPU coolers don't even have 4 pin fan controls so they're stuck at a constant speed, and your case fans are usually 3 pin as well, meaning they can't be controlled.
Honestly, as long as you have good cooling, you don't need as much airflow as people think. Either get yourself low RPM fans (maybe Noctuas, which will give you the option of using their low voltage adapters), or get yourself a fan controller to control them yourself.
On my HAF X, my 200MM fans are blowing at 400RPM, and my 140MM exhaust is blowing at 600RPM. My 120MM CPU cooler fans are blowing at 800RPM. Finally, my GPUs are the loudest, as their tiny 60mm fans blow at 1400RPM on idle, and 2500RPM load. The GPU fans are the only fans that ever speed up in my system...the rest are always constant speed.
Kyaw said:
For the most part, you need to use fan controller hardware to control fan speeds but you can control fans using motherboard PWM headers or automatically based on temperature of the CPU etc.
I never seem to be able to find fans that actually come with the PWM header. Really though, as long as you have big heatsinks, low airflow shouldn't be a big problem, so setting up profiles for airflow should be unnecessary.
If I were building a silent PC today, I'd probably go with the Antec P183 or Fractal R3, swap the fans 800RPM Noctua fans, get a DH-14 cooler, and a triple slot Asus GTX 570/580 (hopefully it can actually fit in the R3). I'd suggest the Noctua fans just because they come with the low voltage adapters, which would be useful since the P183 and R3 aren't very friendly to dial fan controllers, due to the closing door.