First tell me what you're going to plug it into. Do you have a PCI Express slot?
Also, list the specs of the rest of your computer (Processor/RAM) so I can think about bottlenecking.
HINT! Whatever you tell me, I'm going to look up the answer to your question on: http://www.tomshardware.com/2007/07/03/the_best_gaming_video_cards_for_the_money/