Anybody crossfiring a 4850 with a 4830?

Question is in the title. Im pondering doing this for a little extra juice, I just cant quiiiiite max out EQ2 (shadows maxed and all) with reasonable FPS with just this 4850. I was looking at the prices between the two cards, and the HIS IceQ4 4830 is only a few bucks less than the 4850 one I already have......which answers the question of choise. But im just wondering if anybody here is crossfiring these two cards, and do they have numbers (benches).

Thanks in advance.