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Tom's Hardware > Forum > CPU & Components > CPUs > Loud fan ONLY when putting side panel on?

Loud fan ONLY when putting side panel on?

Forum CPU & Components : CPUs Loud fan ONLY when putting side panel on?

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The temps are fine..50c under close to full..what they normally are, but ever since changing the motherboard, whenever I put the side panel on, the CPU fan (I'm 99% sure it's the CPU fan) starts roaring. And the temps are fine!

What the hell could be the problem? When I take it off it sounds fine..but it's really annoying with it on..

Reply to kandon
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could the panel be vibrating? press you thumb into the panel and see if the noise changes.

Reply to 13thmonkey

13thmonkey wrote :

could the panel be vibrating? press you thumb into the panel and see if the noise changes.



It's not the panel vibrating. Even when I just hold the panel like in front of the opening (almost like covering it, except not) the CPU fan starts roaring. I read in ONE place that it could be air turbulence or something..but all I changed was the motherboard. The little knob on the CPU heatsink (the one you flip over after putting the heatsink on to clamp it completely shut) is facing the top of the case..where there is a fan. I don't think that is the problem though..

I couldn't find anything else about that air turbulence thing though..

:( Could it be a bad heatsink? Should I get a new one like the Hyper 212+? :O

Also, could it be bad application of thermal paste?

Or..maybe it is because the knob on the heatsink is facing the fan?


Also..not really related..but is it normal for a Phenom II 970 to spike to 20-30% CPU usage while on an Internet page and while moving the mouse wildly in every direction? I asked my friend with an i7 on his Alienware and he said it only made his CPU usage spike like 1-3%. Mine went from like 2 to 20-30. Then again it is an i7..


Message edited by kandon on 02-09-2012 at 07:47:51 PM
Reply to kandon

I7 has twice the thread count, 4(Phenom)8(I7), so the same work load uses half the cpu percentage on the I7 automatically.

Are you positive of what your temps were before with the old motherboard vs the new one?

Also cpu fan speed is controlled by the motherboard BIOS, and usually there is a smart fan profile to speed the fan up to certain percentages based on cpu heat/voltage. The difference in fan speed is probably a result of difference in fan options in the BIOS. You should be able to play with these settings and get it so your cpu fan only speeds way up when actually needed.

Reply to loneninja

the fan speed thing has got me stumped, i have a fan that speeds up when I remove the filter in front of it, but then i'm removing load on the fan. But there's no way I can think of that moving the cover close to the case would cause the fan to speed up.

Reply to 13thmonkey

@loneninja

Yes the temps are the same.
I checked the BIOS (I have an ASRock 970 Extreme 3), and changed the CPU to manual or whatever, and it didn't help. But how could that be it..? The noise ONLY happens when the cover is on..

@13thmonkey

Could it be I put the heatsink on the wrong way? The knob thing is facing the top of the case, where a fan is.

I really don't know what to do ;(

Reply to kandon

the knob thing? pictures woudl help

Reply to 13thmonkey

Yeah, I found out that the noise only goes away when removing the side panel FOR A LITTLE while. After that it still makes the noise. The noise is only really bad when playing a CPU-intensive game, or using a CPU-stresser. This proves that it is the CPU.

Could it be that I put the heatsink on the wrong way or something?

Also, by the knob thing, I meant this: http://i44.tinypic.com/2d4apw.jpg
It's facing up, towards the fan, but now that I know it isn't 'air turbulence' because it happens even when the side panel is off, it has to be that I did something wrong with reassembling the heat sink.

Any idea if that's what it is? Should I reassemble it? Should I get a new heatsink like the hyper 212+?

If not, what do you think? :O

Reply to kandon

Have you seated everything correctly? It might be resonance...when you load the CPU up, the fan spins up and it might be the heatsink is slightly loose and resonating off of the mount.

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Reply to diellur

kandon wrote :

Yeah, I found out that the noise only goes away when removing the side panel FOR A LITTLE while. After that it still makes the noise. The noise is only really bad when playing a CPU-intensive game, or using a CPU-stresser. This proves that it is the CPU.

Could it be that I put the heatsink on the wrong way or something?

Also, by the knob thing, I meant this: http://i44.tinypic.com/2d4apw.jpg
It's facing up, towards the fan, but now that I know it isn't 'air turbulence' because it happens even when the side panel is off, it has to be that I did something wrong with reassembling the heat sink.

Any idea if that's what it is? Should I reassemble it? Should I get a new heatsink like the hyper 212+?

If not, what do you think? :O


that knob thing is the latch that hold teh hsf in place, it shoud be pressed down to apply pressure to the cpu, and hence let the HSF work. Press it down now.

Reply to 13thmonkey

13thmonkey wrote :

that knob thing is the latch that hold teh hsf in place, it shoud be pressed down to apply pressure to the cpu, and hence let the HSF work. Press it down now.



It is pressed down XP.

Reply to kandon
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