Im buying a new video card, what do I need to know?

[Zlejedi]

Cougarman said:
those cards consume over 200 watts each, you will need at least 500 watts power supply to run them

Don't listen to him any good quality power supply with 350-400W will be enough to run card like this.

http://www.xtremesystems.org/forums/showthread.php?t=108088

Anything with 400W from tier 3 or better will be enought for your system.