Going from a 8800gt (512mb) to a ATI 4780 (512mb) would I get a decent jump in performance? Would it be more noticeable for new games? I'm play games in XP. I use a 27" @ 1900 X 1200. I don't play anything too taxing, but have ordered Empire: Total War and think this may be more punishing on my current card. I'm put off by the high price, if it was the same as a PC card price I'd be all over it.