Just sunk some $ into a new desktop pc for myself... (missus gets the old one ). Im reading so many conflicting and useless reviews stating power draw requirements etc on the graphics cards... Basically, the components are: Upgrading components to: Asus P6TD Deluxe (with a 'huge' 4cm slow fan added to the N 12gb Corsair 2000mhz ram Core i7 950 Noctua NH-U12P SE2 (has 2x 12cm cooling fans) 2x Gigabyte GTX580s Remaining from the existing machine: Lian Li PC-A10B Coolermaster 1kw PSU (has a 14cm cooling fan) 150gb WD Velociraptor 2x 500gb Seagate Barracudas in stripe 1x 2tb WD RE4-GP Enterprise drive Lite-On BluRay burner Case cooling: 2 front mounted 12cm fans, filtered 2 side mounted 14cm fans, one over ram section, other over gpu section. both filtered. 1 rear mounted 12cm fan behind cpu cooler 2 top mounted 12cm fans, one over cpu cooler, the other over the burner So, at last i get to my question: Will my 1kw PSU handle that? . Im a little uneasy, though most reviews state an SLI system draw is in the region of 700w at 100% load (not realistic of course), and thinking perhaps i should sink another $150 into a second PSU, just a decent 500w or so to run the system, and leave the 1kw for the gpus? Thoughts?