Originally Posted by Sir Random
If the BIOS flash works, then SLI should work too.
The 6800GT uses 2.0ns RAM, but the Ultra uses 1.6ns, so the GT ram might not be able for the Ultra timings.
There's a BIOS editor for 6800's that lets you set the ram timings and voltages, so you could make a custom Ultra BIOS with GT timings, to use on the GT.
yeh Nibitor will let you do that, but even though i think it has to have exact same specs to run in sli right, so same memory timings, not just changing the device ID (which is really easy with a 6800 GT) i doubt a straight flash would work, you'd probably have to get an edited BIOS for the GT, or flash the Ultra to a GT