Fan spinning really fast

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pmurph

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Apr 17, 2011
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Hi, my CPU fan has been spinning at 3300RPM thereabouts for about a year now, after changing my thermal paste 20 minutes ago for the first time ever as well as cleaning out the heatsink my idle temps sit around 35-40 and my fan is spinning around 3400 now.....

Can anybody give me any possible reason for this as well as a fix/ suggestion on where to go from here? It's beginning to get pretty frustrating and i'm worried i'll damage something. I can't see how the fan speed went UP from applying new thermal grease/ cleaning dust out.

Thanks, Paul.
 
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pmurph

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Apr 17, 2011
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Also i should probably add that for some reason speedfan, ASRock OC tuner and HWMonitor all say my chasis fan isn't spinning and HWMonitor specifically only picks up one fan, I know there's at least 3 including my CPU fan. : /

Update: OK , I have 3 case fans and 1 CPU fan, after turning on all the LED's in my case for the first time in months i can actually see them spinning. The topmost fan appears to be spinning slower than the rest, although this could be an error of my eyesight as it's the only one without an LED to illuminate it. I just checked my BIOS settings, Cool n quiet is disabled(A suggestion i saw in another thread) it definitely says my CPU fan is sitting at around 3400 and the chasis fans show up simply as "N/A" . Really at a loss for what to do here guys. Any help is vastly appreciated. Thanks.
 
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oj88

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May 23, 2012
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3% increase is really nothing to worry about. Fan's speed detected is like a sine wave, at one second it reads at 3200, seconds later it reads at 3300, then 3400. At least the CPU idling temperature is at its low range. Some thermal paste takes some time to be cured. Why don't you wait and see a few more days.
 
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pmurph

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Thanks, it wasn't so much the 3% increase that worried me though, more the fact that it was in the 3000's in the first place and that most programs aren't registering my chasis fans when they do appear to be spinning(Although maybe not as fast as they should be) I'll give it a few days and see if the speed goes down at all, and i'm glad to have temps in the low 30's again to be sure.

I guess my main problem with this is that I was looking to overclock a little and i don't wan't to do that at all until the fan slows down a little.
 
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oj88

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May 23, 2012
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I see that there is no h/w change, but rise of fan speed. So what was the initial fan speed, In 2000's or 3000's? Cleaning up CPU heatsink and fan should help lowering the temperature. Case fans help too. The last problem area I could image is if the CPU and heatsink are bond perfectly by the newly applied thermal paste. You have to check other areas before going for the last resort. BTW, CPU fan connector is 4-pin, which supports PWM fan speed control. Is it in your case?
 
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oj88

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To exclude the cause from case fans. Take off the side panels from the tower, leave the case open and check if there is any difference on the temperature.
 
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pmurph

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It's a 4 pin fan with speed control yeah, i believe the original speed was the late 1000's to early 2000's. I'll try it with the case open and get back to you, but as it stands the temps are around 30-35C.
 
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oj88

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Back to your first message, the CPU fan has been spinning 3300 for a year. You need to think what did to your PC a year ago, either on hardware or bios. Hardware-wise, adding a new graphics card can get a lot of heat, which rises up to the CPU and increase the CPU fan's burden. Software-wise, go into to the bios and try different settings on the CPU temperature fan control. And see if you can get the fan speed in half.

BTW, some fans (eg Noctua) come with speed-reducing resistor as accessory. Taking it out will surely raise the fan to its highest speed. It is my common practice to add resistors to different fans in my case to get a quieter PC, instead of buying expensive fan controller.
 
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pmurph

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hmmm, wouldn't my temps go up quite a lot of i manually cut the fan speed? Hope I'm not being too difficult here, Changing anything in the BIOS seems pretty daunting in case i mess something up.
 
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splinter007

splinter007

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CPU fans typically run from 1000-1500 RPM (depends on your fans), so you should be totally safe with manual adjustment. Of course, the faster it spins the cooler the CPU will be.

Set it to about 1200 and check your temperatures to see if they're acceptable.
 
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oj88

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You can write down all the bios settings of your motherboard (mobo) first, then reset bios to default settings. So if anything goes wrong, you have the on-paper backup to look up. Smarter mobo allows you to configure the CPU fan to different speeds in different temperature ranges. For example, full speed when CPU temperature >= 60c.
 
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pmurph

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Thanks I'll try all these things, it's not even that the fans noise level bothers me even slightly. It's actually pretty quiet, I quess i'm just worried about the fan itself breaking or something. Again , thanks for all the help.

Paul
 
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