Hi Dominaterx,

choose more reliable ones?.I just thaught a fan is a fan..

Well, not quite There are two basic sorts:

1. Those with nylon bushes
2. Those with "bearings" (ball race filled with steel ballbearings)

Although nylon on nylon is quite well lubricated, the ball bearing type is much more reliable and longer lived. This is the type you want for your CPU fan and an expensive video card.

The bush type are OK for case and exhaust fans. The fans also run at different speeds and shift air at different rates, usually expressed in cubic feet per minute (Cfm). It is important that you get one that meets the specification of your heatsink or is better. This is because the heatsink merely conducts heat away from the processor, it is the fan that gets rid of it.

Hope this helps