Alright So right now i have an 8600GTS 256MB with a core of 710 in my computer. I am thinking about upgrading to a better card like an 8800GTS 640(or whatever it is) or an 8800GTX 720(around there lol...sorry for the dumness). Anyway i noticed there core clocks are much lower than my 8600GTS, they are like only around 550...erm any help on that part? Are they a lot better but y do they have a lower clock. Im only upgrading so i can run Bio Shock and the really new DX 10 games to there fullest potential, but is the high Core clock good for older games like CSS or something? Ty for any help.