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Old 05-25-2018, 01:32 PM
jcmoxy jcmoxy is offline
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Join Date: May 2018
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Default Max Fan Speed for H80i v2

Hi. I recently replaced an H90 AIO with an H80i v2 AIO. The new cooler is keeping my CPU (i7-8700K) @ about 3-5 degrees C warmer (30C - 35C at idle) than my older H90 AIO (About 30C at idle). On the H80i v2 I used stock TIM, whereas on the H90 I used Grizzly Kryonaut, also the H90 pulled air into the case whereas the H80i v2 blows air out of the case. So, maybe with a few tweaks I can get the H80i v2 to where my H90 used to be ... some stress testing will eventually tell when I get the time. Any tips on improving performance is welcome.

So, my question arises from one of the H80i v2's tech specs. The box says the fans max out at about 2435 rpm. However, Corsair LINK software suggest that at 100%, the CPU fan's speed sits at just about 2000 rpm. Also, some software that came with my mobo (AORUS Gaming 7) suggests the CPU fan maxes out (and is running) at about 1442 rpm.

This told me I may need to take a look at some BIOS settings. It features the option to set the CPU_FAN header to AUTO, VOLTAGE or PWM. Which should I choose? I'm presuming the VOLTAGE setting will allow me to set a specific voltage to the CPU_FAN header; and I read in various places the H80i v2 requires a continuous 12 volts. Is that correct? At the same time, the SP120L is a PWM fan, and that makes me think I should choose PWM. (I'm guessing the correct selection here will let me reach max fan speeds as indicated on the H80i v2's fan tech specs)

At the moment I have the CPU FAN header set to auto.

Thanks for any tips and/or advice. This is a second build (an upgrade to my 1st), and I know just enough to know there's a lot I don't know about building PCs.

Last edited by jcmoxy; 05-25-2018 at 01:37 PM.
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