Nixonplumber

Hello, I have only been having driver display issues with Arma 2 OA no other games. I run mods like ACE ACRE etc. At different times in the game (example 10 min or 30 min into the game) its sporadic but my driver completely goes haywire. It starts with real sharp lines coming from my or other soldiers heads then the the ground will turn white and it always progressively gets worse until I have to log out. When this happens I always check temp and idle its about 32.0C and in game I've seen it at 71.0C. I've re-seated the card in the bus as that was suggested to me in game yesterday. I'm running win 7 64 with an i7, 8GB ram and as stated in the title a nvidia 560ti using the latest 310.90 driver. Any help would be greatly appreciated as this is really frustrating. Thanks