I've done that. heh I've done 2-3 OS installs while cold. What I really love to do is play games that are CPU limited under DI.

As for voltage, I'm with them. It's safe to run 1.6x under dry ice. I think I've personally run as high as 1.7x on the 955 I was using (a total dud compared to yours). Heck, 1.55V is safe on air if your temps are reasonable.