Hi guys my OC project hit some problem and I think it is time to ask for help :P

Right now I think I have a stable CPU and RAM overclock. It is either 450 x 9 @ 1.35v or 450 x 9.5 @ 1.43v, RAM is L&S in both case. They are both Orthos stable.

But I hit all kind of graphic problem in this overclock setting. RealPlayer would crash my PC, 3DMark06 stop after 3 hours, GRID crashes almost immediately, and it can't complete a 99 loops Crysis Benchmark run.

the GRID issue is worth mentioning. At 450 x 9 @ 1.35v, it crashed at the opening moive. But if I increase to 1.375v, it was much better, but seem it was still not completely stable.... then I tried a 6 Hour GTR2 run, seem ok, but when I go back to main menu it crash immediately, screen distorted.

Also, reducing my graphic card overclock seem to have some help to this situation, but this overclock was tested and confirmed stable before I start my CPU / RAM overclock....

I think that other than CPU voltage there is another thing that I am missing. Is it NB and SB voltage?

And I have SLI. Is it the SLI instability problem you guys talked about?