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CPU fan trouble.. please help

by MichaelJ2005 / April 5, 2009 8:38 AM PDT

Hi, I have a Q6600 quad core processor on a Gigabyte EP45-UD3LR board. When I first boot my PC up, the CPU fan will run for about 3-5 seconds then stop. I have looked at the setting in the BIOS and everything seems to be set correctly. Does anyone have any suggestions for me??

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On modern systems?
by R. Proffitt Forum moderator / April 5, 2009 10:15 AM PDT

I find the CPU fans to be thermally controlled and under CPU control. When you first boot the usual system is to max out the CPU fan since the CPU, bios and such have not taken a temperature reading yet. After it gets going it throttles back the fan speed.

Sadly, no maker seems to document how this all works anymore.

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Exactly what do the setting options say ?
by VAPCMD / April 5, 2009 11:12 AM PDT

Doesn't the fan come on when the CPU temp rises ?


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by MichaelJ2005 / April 5, 2009 9:46 PM PDT

The CPU does not come on when the temp rises. It was up to 70C at one point and the fan never came on. There is a SMART setting in the bios that allows the CPU to control the fan. I disabled this, therefore the CPU should run at 100% speed all the time, but it doesn't. I also have tried leaving the SMART setting enabled but it still doesn't come on.

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Sounds like a warranty issue.
by R. Proffitt Forum moderator / April 5, 2009 10:04 PM PDT
In reply to: re:

", therefore the CPU should run at 100% speed " is an assumption. I have yet to read that this will happen on any board made today.

If you don't want to deal with the warranty why not wire your CPU fan directly to a power supply connection? I had to do that a few times on old iron that we wanted to keep in service.

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(NT) Check the FAN on another header...maybe it's DOA.
by VAPCMD / April 5, 2009 10:27 PM PDT
In reply to: re:
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