I've been looking it for a while now, because I'm having problems with my 6800 Ultra. Before I flashed it with 2121 (dvi enabled) rom, I used 2130 oem rom. Apart from having to use VNC to init my display before getting a picture from the DVI port, it worked like a charm. Now with 2121 rom DVI is working like it should, but I'm getting graphical glitches. I'm pretty sure its the rom, since the card runs cool and the glitches occur only randomly on desktop. I've stress tested the card with games like Quake4 and Halo without any problems.
I've fitted a 128k rom chip, so it doesn't matter if the rom is reduced or not.