Ooooookay, some quick Googling tells me that the 4850 is going to be about 10% faster than the 9800, with some game-specific variation (obviously). All of the tests I found were of the 512 meg versions of the cards, but there's no logical reason why the results of identical chipsets should change when you jump to 1 gi

If you look here you'll see that the 9800 has trouble competing with the 4830, much less the 4850.

Seems pretty cut-and-dried to this lemur.