Yeah, cooling is probably an issue in the case I have. I was going for silence over temperature so I just had one case fan and the CPU fan. I just ordered the CPU fan dignan suggested along with a ThermalTake Shark case which looks like it'll be good with the cooling, and should let me spread the HDs out a little bit with the 7 3.5" drive bays. Hopefully that solves the problems at least temporarily until I can afford to drop more for a serious upgrade with bigger HDs etc.