Hi. I recently bought a Sapphire 6950 2GB Dirt 3 edition... Whenever I try to run BF3 in Ultra settings (AA off), the game crashes after playing for about 10 minutes or so. There's no stuttering and what not; The game runs smoothly until it just crashes with an error message showing, "Battlefield 3 has stopped working."
However, when I do set it to "High" settings, the game runs flawlessly.
Shouldn't 2GB vram be enough to not crash BF3 in ultra settings? Should I RMA my videocard?
 I am currently using the official latest 11.10 drivers.
VDDC, is that your GPU voltage? Seems a little low, my card runs slightly higher than the reference voltage at 1.112 (reference is 1.108v). I play BF3 on the same settings at 1920x1080 and have not experienced this.
Have you tried running anything like 3dMark to see if stressing the card in general causes crashes?