When playing with Outerra sometimes it happens that the driver crashes, and a Windows popup comes out saying that the AMD driver stopped responding and has restored.
Outerra uses OpenGL, and I know older catalyst versions had severe problems with it, so I guess it must be related to that. I don't really think it could be due to overheating or power failure, since it doesn't happen with other games.
I have an HD4850, and i run Windows7 32bit. I tried both catalyst 14.4 and14.6 beta, and it happens with both.