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Fan behaviour question

Oscraft
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ok, so i don't know much about how motherboards decide how to keep things cool, but i have noticed my computer (cpu fans) is noticeably quieter when my gpu is not installed, as in it seems to ramp up to full speed much more frequently when the gpu is installed, my gpu is a strix 970 so it is actually quite quiet itself, i don't usually ever hear its fans over the cpu.

 

Anybody know why this might be happening

 

anybody know if i can fix it (no settings for it in the bios as far as i could see)

 

also the freq. of the fans speed ramping up isnt affected by room temp, it also worth knowing that its a dell inspiron desktop motherboard originally

some info on this would be greatly appreciated :)

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5 minutes ago, Technicolors said:

your 970 strix is dumping the heat into your case. since the air cooler for your CPU takes air from inside the case, it'll share the GPU heat. 

i dont think its that, i mean the graphics card heats up to around 60c before it starts spinning its own fans but the cpu is water cooled well above its capability so it stays in the mid-high 30s (degrees C)

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10 hours ago, Oscraft said:

i dont think its that, i mean the graphics card heats up to around 60c before it starts spinning its own fans but the cpu is water cooled well above its capability so it stays in the mid-high 30s (degrees C)

True, but the way cooling works is that you setup curve which fans follow. Curve uses either GPU or CPU temps as baseline. When temps go up, so do fan speeds to keep temps lower. More heat in case -> faster CPU fans need to spin to keep temps at that 30C.

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1 hour ago, LoGiCalDrm said:

True, but the way cooling works is that you setup curve which fans follow. Curve uses either GPU or CPU temps as baseline. When temps go up, so do fan speeds to keep temps lower. More heat in case -> faster CPU fans need to spin to keep temps at that 30C.

man i dunno wtf's up with it, i loaded up speed fan, changed Pwm1 from 0 to 5 and the fans suddenly went silent (they ramp back up once it hits 85%)

Capture.PNG

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1 minute ago, Oscraft said:

man i dunno wtf's up with it, i loaded up speed fan, changed Pwm1 from 0 to 5 and the fans suddenly went silent (they ramp back up once it hits 85%)

Capture.PNG

Maybe mobo doesn't support 0% mode.

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