Comp making a lot of noise. dust around fans or CPU?

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02 Dec 2011, 10:33 am

Orr wrote:

Hello Nick007, I hope you are well.

My brother has the Dell XPS 435 MT. It was extremely noisy, the cpu fan constantly thrashing, updating the BIOS made no measurable difference, so I bought him a Mugens 2 heat sink, and a replacement case.

The heatsink would not fit the motherboard without modifications that my brother was afraid to make, so we put the board in the new case, with the original intel heatsink, and it now runs markedly more quiet. I think the airflow within the small 'studio' case is very poor, most likely linked to the relatively small form-factor.

It is noteworthy, in my opinion, that the backplate on the 435 MT was integrated to the Dell case. Although everything is running fine, and with less noise pollution, in the new case without a backplate, this is sub-optimal, and an annoying feature of this system.

I'm doing fine. How are you doing?
I have the full tower; NOT the minitower. It's listed on dell's site as xps 435/9000. I don't understand it but I think maybe dell used the case of the 900 & parts for the 435 in this model. I never had any problems with fan noise till now so I'd like to go the simplest route & replace the fan heat-sink assembly with the same type.

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Orr
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02 Dec 2011, 11:13 am

I am terribly well.

The Dell case my brother's PC was in had only one fan, a small exhaust at the rear. If the fan configuration of your larger case is similar, perhaps you are able to fit another fan. Often there are mountings on the side, top, bottom and/or front of the case for this purpose. Fans can be powered from the molex connectors of the psu, or y-splitters are available to attach more than one fan to the sysfan header on the motherboard. Good airflow from case fans means the cpu fan has less work to do, and does not spin up to full speed on loading a game. In the new case, with better airflow, the cpu fan only spins-up for momentarily, during POST. Fans are cheap, and it is nice to have spares in case you need to build a new system in a hurry, because you are afflicted by a terrible obsession with building a new system.

Hope you keep fine!

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nick007
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02 Dec 2011, 12:24 pm

Orr wrote:

My comp has 3 fans. The cpu one is inside a little tube thing & there's a vent on side of the case that the tube thing meets the case. There's a fan in the rear & one in the front.

nick007
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02 Dec 2011, 1:49 pm

I did a lot more searching & I figured out what the part number was. I found it on eBay & a few other sites that had it used for about $32/35 & I found it new on eBay & another site for $70. Someone on another forum was having the same problem with that fan assembly & someone suggested he call dell for parts so I did that. They carry it but they are temporarily out so the guy will call me back in a few days; he said it would be about $40. I'm not hearing the noise rite now but I didn't screw the case in so I can take it off easily & tap the fan incase it does. I'll celan it out again when I put it in.

marshall
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02 Dec 2011, 6:27 pm

dmm1010 wrote:

marshall wrote:

If there's a performance difference with the sound that indicates something more serious. I'd back up all your data ASAP.

Also, are you 100% sure the sound is coming from the CPU fan? There's no change in the hard drive light behavior when the sound changes right? Or any of the other drives, like CD/DVD or anything else you have?

If the processor begins to overheat, its clock rate will be effectively reduced by the internal thermal control mechanism(s).

I guess then it might be the fan malfunctioning and slowing down when it's supposed to be running at its top speed.

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13 Dec 2011, 2:44 am

Dust collects inside the power supply also. It can clog up the works. You can take the case off of the power supply and blow the dust out with some canned air, just handle it carefully. The fan is more difficult to clean in PSU's. Also if the dust is sticky (smokers house) don't blow the dust with canned air near the fans, it can cause it to jam up the works. The tar gets inside and glops things up a bit.

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