I am running two water cooled 4850x2's on an x58 motherboard. I have attempted to OC them past the 700/1054 mark, but they keep locking up. I used Rivatuner to notch them up incrementally. So far I've found them stable at 670/1054, but I feel they can go further. I tried to run Radeon bios utility but the bios information I receive from gpu-z is not compaitable with it. Anyone know another way to dip into the bios settings?
I'm fairly new to overclocking, any advice would be much appreciated!

Nick