My 6800NU arrived yesterday.
Unfortunately I've had artefacts on the BIOS boot up screens as well as Windows.
I've tried a Q-Tec "550W" PSU and a AOpen 300W PSU with the same results. The PSU is my prime suspect (apart from a faulty card of course) so I'm getting a new PSU.
I'm thinking of getting a "Super Flower Real 520w Quadruple Fan PSU".
Here are the specs of my current PSUs:
+3.3V@20A (Max, (Peak=30A)
+5V@35A (Max, (Peak=40A)
+12V@14A (Max, (Peak=20A)
The specs of the Super Flower are not listed on the retailers website and they actually vary depending on which of the manufacturers websites you visit. But one of these could be them: