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 Post subject: Can't locate from where comes case vibrations - Solved!
PostPosted: Sat Jun 12, 2010 1:20 pm 
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Joined: Sat Jun 12, 2010 1:03 pm
Posts: 6
Location: Spain
Hi to all,

I'm having problems with case vibrations and I can't locate them. My PC is:

- Phenom II 955 + Mugen 2 with 2 Gentle Typhoons in pull/push undervolted to 7v
- Gigabyte UD5P (has no fans)
- 4 GB from G. Skill
- HD4870 + Setsugen with 1 Gentle Typhoon undervolted to 7v
- Cosmos 1000 with fans replaced to GTs also undervolted to 7v
- PSU LC8850
- 4 HDDS (1 seagate and 3 WD)

So the problem is that the case has vibrations and I can't determine which component is doing them. I tried to turn off all the fans and it continues. I also tried to use the PSU out from the case and the case keeps vibrating.

The buzz sound sounds intermittently like one second noise, one second stops, one second noise, one second stops and then to the infinity (it's very annoying). Also, if I put the ear on the table I can hear loudly.

¿What can I do? xD

Thanks in advance and forgive me for my english.


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 Post subject:
PostPosted: Sat Jun 12, 2010 3:27 pm 
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Joined: Mon Jul 06, 2009 9:11 am
Posts: 540
Location: Massachusetts, USA
I bet you anything I know what's causing it: your hard drives are creating a harmonic frequency that is intermittently vibrating your case's air cavity. This causes a "voooooommmm--vooooooommmm--" sound

I had this same exact problem, and it was driving me insane. People who came into my room wouldn't notice it, but I couldn't help but hear it 24/7. If you click the link in my signature, you can see how I took care of the problem: suspension.

Now, you have 4 HDDs, and that's a problem. Suspending 2 hard drives is easy, but 4 will give you some trouble. What you could do is spend a little money and consolidate to one or 2 hard drives (you didn't mention how much disk space they are).

If you can't suspend them, try dampening them in any way you can..this is easier said than done if you are mounting them with typical screws to a hard drive cage.

All that said, I can pretty much guarantee it's your hard drives.

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 Post subject:
PostPosted: Sat Jun 12, 2010 9:45 pm 
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Joined: Wed Mar 07, 2007 7:49 am
Posts: 713
Location: Denmark
I have to agree with RoGuE on this one.
It's your harddrives.
You might want to take a look at the HDD Elastic Suspension... Show your pics! thread.

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 Post subject:
PostPosted: Sat Jun 12, 2010 11:52 pm 
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Joined: Sat Jun 12, 2010 1:03 pm
Posts: 6
Location: Spain
Thanks to both, it comes from HDDs (I tried to turn on the computer with no HDDs and it didn't make the noise).

I only have 1 free 5" bay and the HDDs cage is small to do a elastic suspension...

I need to find a solution to vibrations without using elastic suspension. What I learned from this is that CM Cosmos is not as good as people thinks :(


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 Post subject:
PostPosted: Sun Jun 13, 2010 6:03 am 
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Joined: Tue Jan 04, 2005 4:02 pm
Posts: 1608
Location: United States
You can use silicone grommets to reduce the amount of vibration transferred to the case from the hard disks. It helps, but isn't nearly as good as elastic suspension, so I don't know if it'll get rid of your problem. Suspension was the only thing that kept my old 7200RPM Samsung 1TB drive from transferring vibrations to the case, silicone grommets didn't do the trick. My new 5400RPM 1TB (it also has 2 platters, vs 3 for the old drive, which helps as well) produces much less vibration and would probably be OK mounted with grommets. I went ahead and just suspended it as well, though.

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 Post subject:
PostPosted: Sun Jun 13, 2010 6:11 am 
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Joined: Sun May 02, 2010 3:10 am
Posts: 100
Location: Iceland
You can try to rest your HDDs on padded foam.


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 Post subject:
PostPosted: Sun Jun 13, 2010 1:55 pm 
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Joined: Sat Jun 12, 2010 1:03 pm
Posts: 6
Location: Spain
Well, I tried with some kind of soft foam and it didn't work.

At least, suspension worked for me. It was a bit difficult because of space to do, but now I can stand near to the computer without music :o

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Thanks to all of you :D


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 Post subject:
PostPosted: Sun Jun 13, 2010 2:09 pm 
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Joined: Mon Jul 06, 2009 9:11 am
Posts: 540
Location: Massachusetts, USA
there ya go...nice suspension job! its hard with that many hard drives..

if i ever build a server with multiple hard drives..its going in the closet ;)

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The Rig: Asus P5Q, e8400 O.C.'d to 3.6 Ghz w/ Arctic Cooling Freezer 7 Pro, MSI GTX460 768MB, 4x1gb G.Skill@1066Mhz, 320gb WD & 500gb Samsung suspended, Corsair 520W PSU, Windows 7 Professional x64


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