I've got 435MHz GPU & 1.1GHz DDR @ 53'C under full load w/ AIR cooling on an eVGA 6800 Ultra seemingly labeled as a 6800 GT... running stable & no artifacts.
I say seemingly, Bcause it was SUPPOSED 2 B a 6800GT, but when I received it... it had 2x Power Connectors, Dual DVI, Dual-Slot Fan, NO eVGA sticker on fan (rather a nVidia sticker), and a paper saying "Connecting GeForce 6800 Ultra to the Power Supply" advising 450W (I've got 650Watt)... . It identifies itself as a 6800GT in Windows, so I'm not quite sure if this is a 6800 Ultra that didn't make the cut or some kind of Reference Card. Either way, I'm happy w/ 1 Year Warranty, Far Cry, etc. included. It'll B interesting 2 C if I can raise the clock any higher once Zalman gets a Heatpipe designed 4 this thing.