[Bifta]

Originally Posted by Richard M

Not to the CPU but a couple of decent ones in the front are good for your hard disks.

Only if your hard disks actually sit in front of the fans, which in most cases they don't.
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Originally Posted by Electrolyte

Would one of these cool it down enough? I have the 80MM version on the back of my case at the moment.

http://www.vantec.com.tw/stealth_fan.html

Vantec are reknowned for shifting very little air, best avoided.