TechHounds has an article called "Deeper with the GeForce 7900GTX". Here's an excerpt:

The clincher for us (and most probably for the demanding gamers who nitpick about image quality) is of course, transparency antialiasing. After waiting for nearly half a year (hmm, the GeForce 7800GTX 512 doesn't count!), we finally have a card that's fast enough for 4x transparency antialiasing with supersampling. Yes, it's only 1024 x 769, but it's better than dropping down to 2x or 800 x 600.

There are some things we feel NVIDIA should addressed with the GeForce 7900GTX. From what we've seen on the image quality comparison, there's at least two things they should fix quickly: image quality with transparency antialiasing in Battlefield 2 and HDR differences. We admit, these are very minor issues and hopefully they will be fixed with a new driver release. There are also two other things which we griped about in the past: HDR with AA and AA performance penalty. The GeForce 7900GTX is fast, but it still behaves pretty much like the GeForce 7800GTX (albeit a very fast GeForce 7800GTX, mind you). With almost a year after the release of the GeForce 7800GTX, why is there still no change except for fabrication process and speed bumps? The slight increase performance in shader heavy games is also a concern - will the GeForce 7900GTX be able to cope with coming games like Unreal Tournament 2007, ES: Oblivion, Quake Wars etc? We don't know, but from what we've seen, we don't expect playing these games above 1024 x 768 with AA and AF.