merlocka, that's one of the reasons
the other reason is that the GTS uses a poor "on-the-fly" compression method.
precompressed textures look fine (i.e. UT) but when it compresses textures on the fly, it looks butt-ugly, whereas on the Radeon and the 5500, it doesn't
I kinda find it interesting they're up to the 34th revision of this driver, and it's only been out for, what, 6 weeks?