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Why my cpu fans start running high speed when temperature of my gpu gets higher?

Last response: in CPUs
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July 28, 2013 1:41:17 PM

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...

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July 28, 2013 2:07:01 PM

Well if the GPU is dispelling more heat into the case then it is possible that the CPU fan will have to work harder to keep the CPU cool. As the inside of the case gets hotter the fans spin faster.
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July 28, 2013 2:30:41 PM

bryonhowley said:
Well if the GPU is dispelling more heat into the case then it is possible that the CPU fan will have to work harder to keep the CPU cool. As the inside of the case gets hotter the fans spin faster.


Could it really affect so much that cpu fan speed goes from around 800-1000rpm to 4600-4800rpm when temperature of gpu is still around 60°C? I just can't believe that...
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