I am purchasing a new XFX 7950GT AGP (512mb) graphics card and I was wondering if I have to upgrade my PSU or if its good enough-- I have an Antec Smartpower 2.0 SP-450 (450W) that is almost 2 years old. The other peripherals I have hooked up to it are two hard drives (40GB and 120GB, both Seagate Barracudas), a Vantec Tornado 80mm case fan (0.75A, 9.1W) a dvd burner, a cd burner and a floppy. Case has 6 usb ports, all in use (one with a hub) and I have a 2.8GHz Pentium 4 with 2GB of PC2700 memory. I also have an Audigy 2 ZS sound card... and thats about it. Thanks in advance!