I got an i7-3770 pc back in april with a 7770ghz edition in it on the cheap, good processor, ok graphics card, but the power supply in it is only 460W. I'm looking to make a small upgrade on the GPU because the 1gb of ddr5 in my card is a little limiting. I'm having some trouble tracking down wattage specs for the 7800 series amd and the 700series gtx. Even the card in my system is recommeded 500 W which im under, so i'm looking for an upgrade w/ the same or very similar wattage.