The normal 5900 is outperformed by the 5800U in 95% of the "normal" tests and in 70% of the tests the 5800U beats the 5900U as well! It comes first in a pretty fair amount of tests. It begins losing ground when AA/AF are turned on, but even then, sometimes it does manage to beat the extra 10GB memory bandwidth of the 5900. It follows very closely behind in the other cases, VERY closely behind. That monstrous texel fillrate does come handy.