I recently upgraded from a 9800GTX+ to a 5870 and since then the game runs horribly. Before I ran everything on highest settings without issue before but now it's about 15-20fps. None of my other games I've had the slighest issue with. I run BFBC2 on DX11 highest settings without any lag, Crysis runs fine, everything else runs perfectly except for this. I'm running a faster card, why would it start to lag? I'm not using 10.3 drivers because people were reporting issues with battlefield so I'm still running 10.2.