CPU fan header

hibeesmad

hibeesmad

hibeesmad

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7 Sep 2007
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I built a PC the other day. However the CPU fan header didn't work so I plugged the CPU fan connector into SYS_FAN1, is this ok or should I RMA the board?
 
Yep, it'll be fine. You might have to disable any warnings in the BIOS to stop it grumblig about the lack of CPU fan. I have run my P4 2.4gig like this for years. No problems.
 
Don't they have settings in the bios where the cpu has to be a certain temp before the fan kicks in? If you start it up from cold it might take a few mins for the temps to rise high enough for the fan to start.

Total guess that, but possible.
 
PeteLucky7 said:
Don't they have settings in the bios where the cpu has to be a certain temp before the fan kicks in? If you start it up from cold it might take a few mins for the temps to rise high enough for the fan to start.

Total guess that, but possible.
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Is that not a bit risky? If the CPU_FAN header is faulty it could damage my CPU. I'm new to this and this was my first system build thanks.
 
The same happend when I built my friends PC last year, the cpu fan did start spinning until it reached a certain temperature.
Plug a non critical fan in to the cpu fan header.

Rob
 
As already mentioned, on a cold start, the CPU fan probably doesnt need to spin - this happened with my Gigabyte board.
If you don't get any alarms during POST stating CPU fan failure, then I'd say it'll be fine - give it few mins and it will start spinning.
 
Yes, you can change the setpoint in the BIOS.
You will need to check the manual to find it.

Rob
 
hibeesmad said:
Just out of interest, if the heatsink is not attached correctly will the computer shut down? Cheers.
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Because there heatsink is just a lump of metal, there's no sensor to check its attached properly, you'll just notice that your temperatures will be higher than they should. The board will turn itself off once the chip reaches a certain temperature, but if you want to keep an eye on it you can go into your bios once you've turned it on and find the page that tells you the temperatures of the system. That way you can see if its getting too hot at which point you can panic, wee yourself, and turn it off quickly. :p

As has already been said, if you're worried about the fan header being bust, plug the cpu fan in somewhere else and try pluging a normal case fan into the CPU header. If the fan comes on after a while you'll know that its working.

PK!
 
The CPU-Fan header does not transmit or receive any information regards CPU temp, all modern cpu's (Intel anyway) have thermal throttling if the temp gets to high.

Rob
 
So the temperatures in BIOS will be correct under the CPU temperature even though the fan is not plugged into the CPU_FAN header? Is the heat sensor in the CPU socket?

Thanks again.
 
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The sensor is integrated within the cpu it's self, which the software picks up, and I suspect the cpu uses to protect it's self.

Rob
 
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