After trying a few more times, I've seem to have found a possible cause. It seems that VRAM usage starts off at around 600MB, then slowly keeps increasing. The crashing only happens when it almost reaches 1GB, which is the total amount on my card. Never seen a game manage to cause that though...

I'll be able to upload a dxdiag shortly, but the ArmA 3 Alpha folder has no crashlogs. The entire computer was crashed, not just the game.

I have a similar issue. Specifically, while running the game, my GPU appears to suffer an error and shut down. My monitors lose video, and after a few seconds, applications running in the background (Such as music) hang. The computer never actually shuts off however and no crash is recorded, either by Windows or by the game.

There doesn't seem to be any specific action beyond playing that causes it and the time until the failure varies.

I'm running an AMD 6950 1GB
Attached as "Report.png" are the relevant portions from EventViewer. After those messages are just a few things about services stopping, with no reasons given.