I have an asrock p67 extreme4 motherboard, an i5 2500k processor with a Corsair H60 cooler. I've got dual Saphire 6950 video cards with 2mb on each card. I'm trying to overclock it. I can get it to overclock to 4.3 GHz and play Battlefield Bad Company 2 for 10 to 14 minutes before it locks up and I have to reboot. Does anyone have any settings suggestions for me to try to get this setup more stable. Any help would be tremendously appreciated.