DiRT 2 Demo DX11 Performance and IQ preview
 

Of course, this is not to say that performance on the NVIDIA based video cards was bad. On the contrary, it was quite good. We are looking at 8X MSAA at 2560x1600 being playable on the GTX 285, and 4X MSAA on the GTX 275. That is certainly an acceptable level of AA given the high resolution at which we tested. The only problem with the GeForce GTX 200 series of video cards in this game is that they do not support DX11. Thus, they do not benefit from the image quality enhancements available in the DX11 renderer.
http://www.hardocp.com/news/2009/12/...ce_iq_preview/