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Computer noise (Not fans)

2.3K views 11 replies 3 participants last post by  Fjandr  
#1 ·
Not too long ago, my computer started making this abnormal humming noise, something akin to the gentle hum one would normally get when starting up their desktop, except louder and with a sort of mechanical buzz to it.
Do forgive the lack of a better description.

The odd thing about this noise is that it only happens when my computer is booting up or idle. When I start playing a graphically intensive game, for example, the noise gradually softens until it completely goes away. Similarly, when I stop playing the game, the noise slowly returns.
This led me to think that perhaps voltage could be an issue, that perhaps idle voltages might be too low and hence cause a noise, so I disabled the C3, C4, etc power states but to no avail.

I know for a fact that the cooling fans are not the ones causing this noise, as I have disabled them yet the sound still remains, nor is it due to the power supply fan.

Any help would be greatly appreciated! I find many posts regarding sounds appearing when playing games, but have had little luck when the situation is reversed.

If it helps, my CPU is an i7 4790K, and GPU is a GTX 980Ti

Thank you!
 
#5 · (Edited)
When I opened up the case I found no GPU fan, unfortunately :/

Instead of looking like this:
https://tech4gamers.com/wp-content/uploads/2015/05/NVIDIA-GeForce-GTX-980-Ti-Card_1.jpg

It was just like this:
http://cdn.videocardz.com/1/2015/05/NVIDIA-GeForce-GTX-980-Ti-VideoCardz-Com-3.jpg

EDIT:
Another weird quirk I found was that if I rocked the case in one direction, the noise would momentarily soften or cease (at least during the rocking motion itself), while rocking it in the other direction caused the sound to get louder.
Placing the entire case flat on it's side did nothing though.
 
#7 ·
Hi! Thanks for the reply.

Yup, it seems like the complete of inverse of coil whine. Both in terms of the symptoms, as well as the sound produced, which is more consistent and low-pitched.

Also, I'm not sure if I'm just getting paranoid, or if the initial sounds are slowly getting louder as well. They still go away after running games for awhile though.

I tried monitoring my CPU and GPU loads (since I thought it might be tied to them considering how my computer reacts to the load on them thus far), and it just sort of seems that as my GPU gets warmer (towards say, upwards of 50 to 60 degrees) is when the noise starts to go away, and vice versa.

This makes everything seem like a GPU fan is really in play here, but when I used MSI Afterburner to manually control the fans, nothing seems to help the situation. Not to mention the fact that the GPU itself seems stripped of any personal fan...
 
#9 ·
Sorry for the triple post! I suddenly seem incapable of finding the edit button...

Anyways, is there a way to control that Asetek liquid cooling unit in the pictures I posted earlier? I'm not exactly too sure how to start my search since it's not exactly a fan or any sorts.

Also, using a monitoring software, my system which is running at
CPU: 46C, 25% load
GPU: 66C, 44% load
is completely quiet.
 
#10 ·
Ah, didn't think to ask if you were using anything with a water pump. The issue is probably that the bearing lubricant is failing, either because of a defect or ... well ... its probably a defect one way or the other. Something is adulterating it (metal or plastic shavings, fluid infiltration etc.), and as the CPU warms up the lubricant the friction causing the whine stops because of the lowered viscosity. You need to replace it. How soon is anyone's guess. It could work for years, or the impeller could seize up tomorrow.
 
#12 · (Edited)
It depends on how much you're able to disassemble the cooler. If you can get to the lubricant, and the bearings have not sustained significant damage from running without adequate lubrication, then you could conceivably fix it. It just requires repacking the bearings with fresh lubricant.

I would be surprised if one of those all-in-one units is designed in such a way as to make that possible without a significant amount of work, however.
 
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