Ok, so I have a p4 2.8 northwood, 2gb dual on an IC7-MAX3 running with a Sapphire 3850 AGP and I have an antect smart power 2.0 400w PSU and everything is running great. My question is that if it is really necessary to get a bigger PSU, atm I don't really have any money to upgrade it? So, everything runs fine and it all stays cool, do I loose performance because of the smaller PSU? Thanks for the help!