Re: my psu slowing me down ???
Let me look up mine. Yeah, it says minimum of 450 watt power supply is needed to run my version of the 7800GT. The XFX versions say 400 watts. You should be ok with what you have. Try doing some disk cleanups and defrag. It should speed it up a bit.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?