Yep, my fault. I never went in that part of RT because of my relatively poor english(technical), this very complicated for me to understand. Therefor I also didn't went reading those release notes. Ok then, I guess I have to do that. By using 2.05 I can clock sli apparently but maybe again I'm wrong saying this, still learning. I'm well under XP pro(sp2) Thank you for bringing me the specific lines.