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Chassis fan headers not working

post #1 of 6
Thread Starter 
I have two Bitfenix Spectre Red LED fans plugged into CHA_FAN 1 & 2. In the BIOS, I set it to turbo mode. The fans are rated at 1000RPM, but my fans are only going at a maximum of 770RPM. Also, the two fans are spinning at different speeds. One is usually 700RPM and the other is 770RPM. I'm not too sure if these are PWM fans, but does that make a difference if you plug them into fan headers? I'm trying to get both of them to constantly spin at 900 RPM. 700 RPM isn't cutting it.

These are my settings in the BIOS. Ignore the low limit. If I set it to ignore or another value it doesn't change the RPM.


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post #2 of 6
Turn q fan control off entirely. If you want to control what RPM its at, you will need to manually adjust the voltage yourself. The q fan control will just use its predetermined curve depending on which profile you have set.

1k rpm fans are silent enough. Just run them at full speed. I really doubt you can hear an appreciable difference between a fan spinning 900 and 1000 rpm.
Edited by RX7-2nr - 9/18/12 at 2:04pm
post #3 of 6
Thread Starter 
Quote:
Originally Posted by RX7-2nr View Post

Turn q fan control off entirely. If you want to control what RPM its at, you will need to manually adjust the voltage yourself. The q fan control will just use its predetermined curve depending on which profile you have set.
1k rpm fans are silent enough. Just run them at full speed. I really doubt you can hear an appreciable difference between a fan spinning 900 and 1000 rpm.
Oh I forgot to mention that. I completely disabled it, and it still runs at 700 RPM. rolleyes.gif
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post #4 of 6
Did you disable it and reboot?

Just hook them straight to a molex with an adapter and run them at full speed. You dont really need to slow down 1000rpm fans.
post #5 of 6
Thread Starter 
Well I don't have those. I have rebooted. It should be at 1000RPM when I disable it, but it's at 700 RPM. I should be able to use the fan headers properly without buying molex adapters to make them work at full speed.
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post #6 of 6
Quote:
Originally Posted by Evilsplashy View Post

Well I don't have those. I have rebooted. It should be at 1000RPM when I disable it, but it's at 700 RPM. I should be able to use the fan headers properly without buying molex adapters to make them work at full speed.

Well yes, you should but cant. I was trying to think of a way to get it to work.

Try them on another board or find a way to verify their speed at a full 12v. If they still spin at 700 with 12v then its the fans. Try it with another PSU as well. If you can be sure that your $350 motherboard's fan headers just are not receiving 12v maybe you could try to RMA it if its really that big a deal to you. It should qualify for their advanced RMA, and at the price premium you pay for those boards they should work right.
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