My components: intel i7 4770k, Asus Z87 Plus, Gigabyte GTX 770, G.skill Ripjawsx 16GB 1600, Kingston hyperX 120GB SSD, Noctua nh-d14, windows 8 pro
I built this computer few days ago. Now when running tasks only on cpu (like prime95) i get cpu temps on around 50°C and my noctua cpu fans stay quiet. But when also gpu has tasks (for example while playing or running 3Dmark tests) and gpu gets warmer, my cpu fans start running on higher speed too. And when Gpu gets warm enough (60°C or bit more) my cpu fans are running 4600-4800rpm.
So how can gpu temperature affect to cpu fans speed? I have connected my noctua fans with y-cable to motherboard's cpu fan slot.
Another odd thing is that CPUID hwmonitor shows my cpu fans (fanin0) under my video card (gtx 770) not under motherboard or cpu where it should be as far as I understand?
Hopefully you can help, it's quite impossible to play when fans are spinning on full speed...