I just upgraded from an old EVGA 8800 GS to a Gigabyte Geforce 450. The computer and windows boot up just fine, but anytime I start up a game or other high graphics intense program, my computer locks up within 5-10 minutes. As this is the only part that I replaced I'm thinking this is either a graphics card or PSU issue. Anyone have any idea whether the 450 draws more or less power than the 8800 GS? The 8800 ran without issues for years. I have a 450w PSU currently.