I have to warn you these cards BREAK.

 My 7900gs worked great for all of a few months.

 Now every game is filled with artifacts, and occassional crashes.

Thousands of people have this problem.  It affects all 7900 series cards.  If you do not believe me simply google 7900 problems.

 I am replacing my card today with an 8800 640mb because it comes with a nice cushy lifetime warranty.

Just stay away from the 7900 series.