Bios revisions of 1.43B(might b 1.44B too)+ 1.3 only support Dual opteration Durons, mine perfectly supports Dual XP's, though Bios revision 1.1 and 1.0 even 1.2 dont support Dual Xp's dont know y. there was another K7D MASTER-L mainbord (it was green colored, mines red) mabye I have revision 1.1 of the board, but probally not, I think there was only rev 1.0 but I'm not gona turn the comp off and look (crunching important data right now)

Dual opterons and 2x increase? Ohh I know I think they still get pretty high though (like 1.79-1.86 scalling,) I might b wrong on the scaling part, I rember reading a thread abt dual opterons, but that was 4 months ago.. my Dual Athlons scale much worse, like 1.37 or 1.6 if im lucky