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tstuber
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Dell Optiplex 790 Fan Noise

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hello
I bought a brand new Dell Optiplex 790 with SSD, 8GB Ram and i7. The System is brilliant so far.

The only thing is the noise of the CPU Fan, with is "very noisy" for a business device such this. I know, this is not very precise, but I don't have a decibel measure device ;-) Normally, the business desktops are nearly noiseless. 

I thought I could update the chipset for possible failures, but everything seems to be up to date (Dell Client System Update).

Does anybody has a idea what I could do? Maybe missing Software or other points?

Thank you very much!
thomas

					
				
			
			
				
			
			
				
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9 Replies
theflash1932
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Re: Dell Optiplex 790 Fan Noise

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I have a 790 sitting right next to me, with the only differences being mine has an i5 and I'm running and SSD and a HDD.  It sits there perfectly silent while I compile Java code and run a Windows 7 VM in the background.  I would suspect a fan problem with yours - try reseating your fans and make sure the cover is on securely.

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tstuber
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Re: Dell Optiplex 790 Fan Noise

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Thanks for your hint. I'll give a try in the next minutes.

I found a hardware analysis tool at startup. The normal Fan-speed was for the CPU and Motherboard-Fan around 1600RPM. This semms in my opinion ok. Under high performance they raised up to 2400 RPM, which was even more loud than "normal" Smiley Happy

So I hope you are right and something with the seating is wrong.. 

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tstuber
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Re: Dell Optiplex 790 Fan Noise

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I checked the seating of my fans. everythings seems to be how is has to be.. Smiley Sad

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theflash1932
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Re: Dell Optiplex 790 Fan Noise

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Did you simply check the seating, or did you reseat the connector?  

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tstuber
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Re: Dell Optiplex 790 Fan Noise

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i just checked it. You mean I should really reseat the fan(s)?...

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theflash1932
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Re: Dell Optiplex 790 Fan Noise

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Yes, actually reseating (removing, then re-establishing the electrical connection) is an important step when devices are not working properly.  If not enough juice is flowing through a bad connection, it could cause the fan to report incorrectly or not spin high enough (or too high), causing other fans to kick up to compensate.  Reseating is a common fix for seemingly bad memory, drives, fans, expansion cards, etc.

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tstuber
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Re: Dell Optiplex 790 Fan Noise

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Ok, I reseatet the FAN-connectors - but no change... Any Idea?

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tstuber
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Re: Dell Optiplex 790 Fan Noise

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For all the other guys with the same problem:

finally I ordered a IT technican who replaced the fan (CPU-Fan). Result: no change :-)

Since I live in the countryside we have almost no ambient noise. This is maybe the reason for the noisy perception. So I'm looking forward to the great age with hearing problems ;-)

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m00ie
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Re: Dell Optiplex 790 Fan Noise

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Just a wild one,

Try disconnecting the PC speaker from the motherboard, which is at the front of the case/mb under the HDD. (just a white 4pin connector)

It fixed the problem for me, let me know if it works.

Cheers!