Issue appears to be resolved with latest (13.2) beta drivers. Thanks grandma.

Hmm, I'm on 13.1 currently. I'll try out the latest beta.

Damn it, I've got a 6950 as well, NOT a 6900. Couldn't remember exactly.

Correction to last note: also occurs on certain objects (see second screenshot)

This only occurs on weapon models, and does not occur in 3rd person mode.