Abe and Suppafly my brother got the ATI 4780 card recently.
While researching it i read articles saying it has 4 times the performance of your average 8800GTS.
Since my bros old card was an 8800 GTS i was looking for articles comparing the 2 cards.
Having seen his new card in action i can vouch its atleasat 4 times the performance of his old 8800.
Correct me if im wrong but i think the card Grim linked is Nvidias answer to ATIs 4780 series?
From what i can gather it outperforms the ATI 4780, thus making it more than 4 times the performance of your 8800 GTS mate
So yes its a big upgrade.
Im tempted myself but as yet i havent found a game that cant i cant run at 1920X1080 maxxed out with FSAA and AA etc with my current rig.
I too have an 8800 at the moment.
That seems a hell of a bargain tbh.