I'll have a couple of GTX 580 arriving over the next few days and plan to overclock them for folding on. What is the best software to test for stability once overclocked? I plan to install both, then test them individually, and assume a stress tester will be able to distinguish between the two cards (one is an EVGA reference card, the other an EVGA SC, if that makes a difference). I run 3 monitors (currently two are connected to a 550 Ti, the third to a GT 430) all at 1080p, although that won't affect the folding. The SC card will have the two monitors, the reference card the third.