I have seen people say that the x1900xtx will beat the 7900 series for image quality in shader heavy games, but the benches showed the 7900 beating the x1900xtx in Fear with everything enabled, except in 1600*1200. I returned my x1900xtx and ordered 2 7900gt's for my sli rig. That set up beats the x1900xtx in most benches, and even beats 2 of them in Xfire in some benches. That is at stock speeds, and with buggy drivers according to nvidia. So I would bet that rig will best the x1900xtx in Oblivion. They probably created Oblivion to run better on Nvidia cards seeing as how they used them for testing. And as for ATI cards running HDR and AA at the same time, go to
and read what the programmer sais. There is a huge thread on this topic. To sum it up, no card on the market can run both at the same time, and Oblivion will not allow you to do so. I would have kept my x1900xtx if that would have been the case seeing as how Oblivion is probably the main thing I'll play until the G8 series hits and we all upgrade again. But he cleary states that HDR and AA will not run at the same time in the game. Any thoughts??