I am not a fan of watercooling, this thread is not about that debate.
I recently re-tuned my air cooling and made big gains (losses?). I would like to learn what others are doing and if I could do better using your methods.
I wanted quiet most of all when I changed cases and figured thermal performance would be better.
My specs:
be quiet! Silent Base 800 case (my ancient case was too cramped)
The case comes with 2 x 140mm Silent Wings front intake and 1 x 120mm exhaust in back. Those Silent Wings fans are excellent but expensive to add to a non-be quiet! case.
CPU: i5-4690K @4.5Ghz cooled by a Thermalright Macho Rev B. w/ rear duct. The Macho can be a passive cooler when the duct is connected to the rear case fan. I made it a 2 fan CPU cooler setup.
I carried over 2 x Corsair AF120mm white LED exhaust in the roof (a little noisy but not bad)
and a Noctua 140mm intake at the floor. Surprisingly the Noctua is my loudest fan, but it is old.
The PSU has an isolated airflow path with a 120mm fan.
The MSI GTX 970 has a twin fan cooler that does get audible at times.
I admit I have too many fans, but I had the fans already and the case had holes, so . . .
The PC has been working well for over a year. This weekend I was doing some CPU intensive CAD work and the fans were getting kinda loud. Initially I tuned the fans by individually tuning the curves to make each one as slow and quiet as possible while maintaining decent temps. The Macho cooler is excellent and the 140mm fan that comes with it is great too. It's very slow and quiet with lots of air flow.
This weekend I checked the curves and tried something different with success. I increased the speed of the pairing of CPU fan and the rear case fan, greatly reducing CPU temps without adding much more noise. Because the cases fans are now reading a lower CPU temp, the case fans are spinning slower. I used to idle at 30C, right now it is at 21C. When I was rendering I was at 59C max, and afterwards it was between 45C and 50C. Please keep in mind that when I first started rendering on this same system, a few times the CPU got nearly up to 80C.
I watched Carey Holzman this week and his lasse-faire attitude towards fans is a breath of fresh air.
TLDW; Fans shmans. As long a you have 1 or 2, it's all good. Just clean your case frequently.
TLDR;
I aggressively air cooled my CPU until I can just barely hear it, turned down all the other fans to min spin, and saw good results. I basically changed from a positive pressure case, to a slight breeze in the case with a negative tornado on the CPU and Carey's advice worked for me.