Re: Battlefield 3 graphical issue : any idea?
This is a driver issue, nothing is wrong with your card. This has been experienced by a TON of players and I experienced it myself on certain maps at very specific places on the map. This is even talked about on Nvidia's website.
I got rid of it by switching drivers but I'm at work and can't tell you exactly what I am on now. I do think I'm running the latest beta's though so maybe give those a shot!
EDIT: Her's a blurb from the beta page for the 290.53's
Key Bug Fixes
Fixes some random instances of triangular artifacts when playing Battlefield 3 (fix is now enabled for GeForce 400 and 500 series GPUs).
Fixes a default panel resolution/ timing bug in 290.36.
So install the 290.53 drivers and you should be all good!
A64 3200 winchester @2.45
Geil Ultra-X ddr400 1gig @5-2-2-2-1t
BFG 6800GT OC @395/1100
Audigy2 zs w/Logitech 5.1