How do I slow down the fans on a Corsair H75?

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Mark-Burns

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Oct 11, 2013
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I recently bought a Corsair H75 and after multiple attempts at applying thermal paste and remounting, I managed to get it to work properly (I think). The temperature during an out-of-case test was 21°C at idle using a push configuration but this has increased to 30°C at idle using push-pull inside my case. I'm sure this is fine, though.

Is there a way to slow down the fans? I have both fans connected to the optional CPU 4-pin using the included adapter and I have the pump plugged in to the other CPU 4-pin. The cooling seems good but it is slightly louder than I'd hoped. The fans also ramp up momentarily when I open a program which is annoying.

PC Specs:

Fractal Design Define R4 (Non-windowed)
Gigabyte Z87X-D3H
Intel Core i7-4770
Corsair H75 Liquid Cooler
ASUS GeForce GTX 780 DCUII
Samsung 840 EVO 250GB SSD
Seagate Barracude 1TB HDD
Corsair CS750M PSU

Thanks :)
 
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King Kevain
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King Kevain

King Kevain

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Dec 10, 2014
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The Pump Header should be plugged into a CHA_FAN header and set to 100% in BIOS and not PWM or software Managed - if the pump is in the CPU header socket, it will be throttled depending on CPU load and only running at around 600 rpm which will damage the pump over time. The Fans on the radiator should be plugged into the primary CPU header via the Y connector provided, not the CPU OPT Header.

Hopefully there's no Damage to the unit, will depend how long you've been running it like this for.

I don't blame you, I blame the rubbish instructions that Corsair pack with the unit - it is not obvious. But important to remember, unless you specifically set a liquid cooler Profile in BIOS and the MOBO either identifies the pump against the correct Header or you tell it is a pump, the BIOS and Windows will assume its a PWM fan and control it as such.

Easier just to set the pump header to Manual and make it 100% in BIOS so software so OS cannot override it.
 
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M

Mark-Burns

Honorable
Oct 11, 2013
7
0
10,510
I've plugged the pump into a SYS FAN header (I think that's the same as the CHA ones you were talking about) and the fans into the CPU FAN headers.

How do I set the pump to 100% in the BIOS? I'm using a Gigabyte motherboard and can only find a way to change the PWM values.

Also, is there a way to test pump speed afterwards?

Thanks
 
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King Kevain

King Kevain

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Dec 10, 2014
413
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4,960


SYS Fan should be ok - sorry, used to ASUS boards and they call them Chassis Fans :) Gigabyte usually has a CPU Header and sometimes OPT, PWR Fan, SYS Fan and then usually a couple of PWM headers as well.

Change the SYS_FAN value in BIOS to Manual (or maybe Disabled instead of Smart Fan, PWM, Auto) - been a while since I looked at Gigabyte BIOS, maybe read the manual? - If it has Smart Fan Control enabled, turn it off - you want to tell it what to run at. If you give me your BIOS version I can find out exactly for you.

Alternately, if you don't want to muck around with all this, just plug the pump straight into the PSU (may need an adapter) - will run @ 100%

To test pump speed, you'll need some software if your BIOS does not report the speeds - I used to use SpeedFan - http://www.almico.com/speedfan450.exe - I currently use Fan Expert 3 (but only because its built into AI Suite 3) - http://ai-suite-3.software.informer.com/1.0/
 
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