2 MSI R6970 Lightnings....Have to underclock to 905 to not lock up under load. 2 cards, 2 motherboards, 2 PSU's. My question is can a motherboard damage 2 GPUs in exactly the same way, at exactly the same time? 1 6970 ran fine for 3 years, then crossfire 2 6970s and ran fine for 2 weeks, then I have to drop core to 905....Even on different computers. Clean install of windows, six different drivers, Corsair PSU's (750, & 850), New memory....Keep in mind...Everything worked fine for a while...ASUS & MSI don't have anyone who knows anything? 75W through PCI-E blows their mind....Did my motherboard (ASUS P6T-SE) do this??? And HOW!?! 2 cards, lock up @ 940 under load.... 1 card locks up @ 940 under load. Cards work fine @ 905. Different slots, MBs, CPUs, Memory, PSUs, different drivers...There is NO CONNECTION! Did my motherboard damage both cards in exactly the same way???