I wouldn't push a power supply that hard. It usually burns out too soon.
Ok I have a 300W power supply in my computer, I am running dvd-rw, memory card reader, 2xIDE hard drives, a msi ms-7145 micro atx board, and factory fans. I am getting a bfg GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card, and it says it suggests a 350W power supply will mine be able to handle this or do I need to upgrade to more power? If it matters the most intense game I play is Guild wars....no fps games.