> Im building a new PC, (athlon 64 X2 4200+ GF 7800 GT blah blah) Right now the
> only fan I have for external air is a 120mm fan to mount on the rear of the
> case. I might add an 80mm to the side mount in the future. My question is, is it
> better to mount the fan so it blows air into the case or so it blows air out of
> the case? Im pretty uneducated when it comes to cooling so any info you might
> have would be helpful, thanks.
In general, if you're mounting high in the case, then you want it blowing out. If it's mounted low in the case, then in. If it's over the CPU, then that depends on whether you want to keep the CPU fan (case fan out IMO to keep air moving) or ditch it and install a shroud (case fan in IMO to bring cool air directly in).