I own a Dimension 8400 with 350 Watt PSU, 1GB DDR2 Ram, 250 GB SATA 300, 2X DVD (One of which is an R/RW), Sound Blaster Audigy 2 SE, Radeon X300SE (poopy card which i want to replace). I want to replace the X300 with a 7600gt , which i know requires a 350 Watt PSU. The part I am unsure is the...