Simple cooling question

March 16, 2010 at 09:16:18
Specs: Windows 7, Phenom II 3.0Ghz/4GB DDR2
I need a solution to an overheating problem.

Specs:
3.0Ghz Phenom II
4GB DDR2
XFX GTS250 512MB
ASUS M2N68-VM Board
OCZ 600W PSU

Current cooling:
PSU fan draws air in at the back and blasts it
downwards inside the case.
Small fan on the back pulls air out the case.
That's it.

The problem:
The PC boots at about 35 degrees C, if I leave
the side of the case on it will rise within about
half an hour to the 50s. When it's under strain
with the side ON the hottest I've seen it get to
was about 72 (10 above the recommended
maximum for my PCU). This is why when I'm
gaming I keep the side off, then it gets to
about a maximum of 55. The whole tower gets quite hot when I leave the case intact which indicates a build up of hot air, either the PSU is not drawing in enough or the little fan is not removing it quickly enough.

The cooler on the CPU is the stock heat-sink
and fan that came with it.

What do you guys suggest I do, preferably on
a budget as I'm out of work currently.


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#1
March 16, 2010 at 09:46:42
PSU fan draws air in at the back and blasts it
downwards inside the case.
Small fan on the back pulls air out the case.
That's it.

I take when you say the PSU fan at the back you mean the case fan just below the power supply. The CPU fan is the big one inside the case that sits on top of the heat-sink and blast the CPU underneath it with air.

The fan at the rear and all rear fans should be drawing air out, not pushing air in. The idea is to set up an air flow from front bottom of the case, to rear top. Any fans drawing air into the case should be at the front but that is very rarely required as the fans drawing air out at the rear will set up a sufficient air flow by themselves.

If you have two fans at the rear, one drawing air out and one pushing air in they are going to be working against each other and you are not going to get the circulation required to provide cool air for the CPU. The CPU fan will just be circulating the same hot air over the CPU continuously.

Stuart


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#2
March 16, 2010 at 13:31:45
"PSU fan draws air in at the back and blasts it
downwards inside the case"

Almost all PSUs, whether it has a fan in the rear or a fan on the underside, draw the air from the case into the PSU & exhausts it out the rear of the case. What makes you thing your PSU does the opposite?


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#3
March 17, 2010 at 05:08:07
When I say PSU fan I refer to the fan inside my PSU that feels as though it pulls air in, although it seems likely that's incorrect...

I have no place in which to mount a fan on the front, and my only spare 3pin fan socket is at the back...


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