So mine had a major/oddball glitch...Was playing for about 2-3 hours and crashed to the desktop. Cool was running at 4ghz maybe it wasn't stable. I booted back up and nothing 3D will load. furmark, kumbustor, Crysis, borderlands 2 etc. Figured well must be the new drivers (had just bumped from 301 to 306) so I uninstalled 306 and went back to 301. Same issue. Disabled SLi and the issue disappeared. Everything 3D works like a champ on each card by itself. Minute SLi is on screen corruption etc. Somehow it crashed so bad that it broke the SLi patch for my board and something is still wrong with Borderlands 2 seeing how it still crashes pretty quickly around the same area.