Fan Control Problems

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flyoffacliff

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Jul 18, 2012
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I just finished my new build with the MSI Z87-G45 motherboard. I have 4 case fans (2 intake and 2 exhaust), but the motherboard only had 3 system fan headers, so I connected 1 of the case fans to the (CPU FAN 2) header since I am only using 1 CPU fan. I can control the speed on the system fan headers via the bios, but both CPU fans go the same RPM, and they are different size fans. Is it possible to have both CPU fans going a different speed?


Also:

1. How can I set the fan speed lower than 50% for the system fans?

2. Is there any other way to control the fans using this motherboard? Either a program compatible with windows 8, or a modified bios for this motherboard.

3. Is it normal for a 800 RPM fan to only report 750RPM current speed in the BIOS? Or should it be running at exactly full speed?

Thanks a lot.
 
Solution
Jaxem
Fans operate within a 10% give or take from my observation, usually within 20 or 30 rpms of advertised, but there's nothing wrong with that speed.

You probably won't be able to change the CPU fan speeds independently, as they're probably meant to do a push-pull configuration, which doesn't benefit much if they aren't going the same speed. The system fans you can set in the BIOS if anywhere, there's often an RPM or temp minimum you can set, but depending on the motherboard, you may not have this much control. If you board does have this level of control, they usually include some sort of utility on the motherboard driver disk that will let you control the fans from the OS
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Jaxem

Jaxem

Honorable
Jul 22, 2013
2,170
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12,960
Fans operate within a 10% give or take from my observation, usually within 20 or 30 rpms of advertised, but there's nothing wrong with that speed.

You probably won't be able to change the CPU fan speeds independently, as they're probably meant to do a push-pull configuration, which doesn't benefit much if they aren't going the same speed. The system fans you can set in the BIOS if anywhere, there's often an RPM or temp minimum you can set, but depending on the motherboard, you may not have this much control. If you board does have this level of control, they usually include some sort of utility on the motherboard driver disk that will let you control the fans from the OS
 
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