Not my video:
http://www.youtube.com/watch?v=Wne75Vjcdl8
I can walk through it and graphics come back.
Some users say it is a game bug.
Eidos says it is likely an Nvidia bug.
Nvidia says it looks like defective Vram.
Sigh... anyone?
What you (and the others) do is simply guessing....problem...it won't get you anywhere.
It could be heat issues, it could be defective memory, it could be too high a OC.
You need to find out WHAT EXACTLY it is by running appropriate tools.
See:
http://forums.anandtech.com/showthread.php?t=2314733
I see you already did some tests. Anyway, make sure to have Kombustor with 4xAA running as well, test 1.2GB of your mem, try 1000 iterations.
Also, then run Kombustor (or Heaven 4.0) for at least 20mins what's your temps?
Edit:
LOL@people who always scream "RMA!" without even knowing what's going on.
I run TR here with TressFX, Tess, 2xAA and did not see this, although I had an issue running Bioshock Inf. with +600 memory, but then I found out that +600 on my memory is too high.