Hi, I have a pair of 9800gt in sli. I've been trying to overclock them a bit today and when I push higher than 700/1780 they freeze in 3dmark vantage. I think they might need a little more juice. I've been looking round and I can't seem to find anything to overvolt my cards. I tried NiBitor, but it doesn't detect my cards. Any advice you guys could throw at me would be really appreciated. Thnx.