Just upgraded to evga 680i, E6600, 2gb corsair ddr2 1066. My 2 6900gt's won't work in sli. Have BFG 650w psu. They worked for almost 2 years on an asus A8N sli deluxe. This is the second evga board (first was rma'd for the same reason, no sli. Tried flashing bios from p6 to P24 to P23 to P21. The second board flashed to P24 (all with the tech's advise), but no sli still. Tried nvidia drivers 84.21 to 91.31 to 93.71. The 93.71 was the only drivers that got me to the control panel and when i enabled sli, and hit apply, the system rebooted and got BSOD. anyone else having sli probs with this board?