I'd have to recommend against an XFX power suppy. My 750W Gold one blew up a few weeks ago and tried to contact their customer service with no luck. I emailed them several times but never got a reply. I ended up buying a whole new power supply. I got the Cooler Master V700 and it's been great so far. For Crossfire everyone is right, 850 watts or more is the recommended. Try to get the highest 80plus rating in your price range and a modular power supply can save you a lot of trouble with cable management. I'd recommend the Corsair HX/AX series, Cooler Master V series, or the Seasonic G/X series. Hope this helps.