So I have this Pc that I built from extra parts,it has a amd 1.6ghz, 1gb or ram,visiontek x1550.I found 2 great deals on newegg for a Amd phenom 9950 quad,or an Intel Q6600 Quad.Not sure which one I should get but they both seem similar.This will be a gaming pc btw. I currently have Vista Ultimate 32bit.So what will happen if I change out the mobo and cpu to the new ones?Will the pc just boot up and thats it, or do I need to format and install my system?And im worried about my psu.Its some iCute, says maximum output 400w,+12- 18A