I have two 4 GB GTX 680s that I have run in SLI for years. I was playing GTA IV at 2560x1600 in SLI with no issues when the screen started glowing red. I decided to test each card separately, I disabled SLI and played the game with the same settings on one card and it ran fine, though lower FPS of course. I then switched cables to the other card and the game still ran fine.
A very fun and unique game called Bridge Construction Set has been updated with tons of new levels and and maps. Bridge Construction Set is a very fun game in which you essentially get to become a bridge designer and build bridges in various locations.