I currently have a Dual 2.0 GHz XEON (with HT) system and I am considering an upgrade to my GeForce 4 ti 4400. I, obviously, know that in non-SMP applications such as games the second processor cannot be used, essentially limiting me to 2.0 GHz. I've heard various reports that suggest, but not difinitively, that below 2.4 GHz a GeForce 6800 nu should be considered, 2.4 GHz - 3.0 GHz for 6800 GT, and 3.0 GHz + for 6800 Ultra. Is this information correct? And if so, are there 256 MB variations of the 6800 nu?