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CPU fan isn't rotating fast enough.

post #1 of 11
Thread Starter 
Hey - I'm having some issues with my cpu fan. When I went to start up my computer this morning it was barely spinning at all - 200 rpms. I went into the BIOS and tried to see if there was some fan control in there - after messing around for a bit I booted up again and it was spinning at 400 rpms. I went back into the BIOS and changed a couple other options and while in BIOS it was spinning at a consistent 1400 rpms. I went to boot again and it was now spinning at 600 RPMS. I ran prime95 for about 10 mins and temps got all the way up to 53C and the fan wasn't going any faster.

Right now I have it plugged into a chassis fan connector but it doesn't seem to spin more than 900 rpms right now.

My question is - whats going on? Idle temps are still real cool - around 30C but why is my cpu fan barely spinning?
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Obsidian
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post #2 of 11
Asus have AI suite on thier MOBO support CD. Install that and use the fanexpert it has loads of options and will allow you to check RPM again.

Have you called your PC Belladonna cos it's mucky or do I know too many pornstar names?

EDIT: Fans usually speed up when they have to unless you set them otherwise.
post #3 of 11
Thread Starter 
I think you just know too many pornstars

But for real - I will check out the disc.
Also in the BIOS I set the option to have the cpu fan run at full speed when the cpu reaches a certain temp and well - it has reached the temp and the fan isn't picking up at all. Even under full load this thing is barely running at 500 RPM, Yet while in the BIOS it is consistently running at 1400 RPM
Obsidian
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Obsidian
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post #4 of 11
you can set a C/fan% curve within fanexpert and I have never had any problems with it.
If you want to test your fans disable any fan profiles and it should run @ 100% that works for CPU anbd Cha fans.

EDIT: Plug the CPU fan back int the CPU fan jumper thingmies you will be able to test it then.
Edited by iamlongtime - 9/13/11 at 10:48am
post #5 of 11
Thread Starter 
Hmm - I adjusted the c/fan% curve and that seems to have worked out well.

Could there be some reason it just decided to be stubborn today? I mean not even hitting 50% speed at 100% load kind of has me wondering.
Obsidian
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Obsidian
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post #6 of 11
Just get rid of any speed stepping on the fan itself, and make it run at full bore all the time. Maybe its temp sensor isn't working correctly so its not ramping up the fan speed appropriately.
Beast of Burden
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Cool story, bro!
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Beast of Burden
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Cool story, bro!
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post #7 of 11
If the fan curve has worked it will be fine If you're not bothered about noise do as DaClownie say's and remove the stepping. If you want it to use what it needs, extend the life of your fan and be quieter stick with AI suite.
Glad it's sorted

EDIT: BTW there is a difference between what temp software will tell you the CPU is at and the MOBO sensor says it's at. I'm running AMD and it's about 6-8c! You might not have hit your limit on the correct sensor.
Edited by iamlongtime - 9/13/11 at 11:21am
post #8 of 11
Thread Starter 
Well - I turned my computer off for a while - came back and booted up and the fan was back to barely spinning until I had to apply the settings again in the FanXpert. Do I need to do this every time I boot up or?
Obsidian
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Obsidian
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post #9 of 11
No I don't think you do, when you load up the fanexpert the settings should be the same. Mine are always the same as I leave them and when I hit warmer temps my fan goes up. have a look after you reboot, or set a curve that ups the CPU fan at a temp just after boot so you can hear it change, this way you will know it's working without loading the app. Good luck.
post #10 of 11
In for more talk about Belladonna.
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