I made this account to post in here, ASSUMING this is the right thread.
Here's the deal: ArmA 2 Demo ran pretty good. Average FPS was 32 or so, and I loved playing it; so I bought the game.
LO AND BEHOLD, I get a new video card (upgraded from GTS 250 to GTX 460) and now, the game will freeze up at random points (makes ArmA 2 vanilla unplayable and won't start up at all anymore, and ArmA 2: OA will randomly freeze up and have a HUGE drop in FPS every so often averaging around 12).
I have no idea WTF is causing this because my rig should blow it out of the water.. even with my old card.
Here's my specs:
AMD Phenom II X2 550 Processor 3.11 GHz
GTX 460 768mb RAM
EDIT: I'd like to add, boot camp and the scenario: "One Shot, One Kill" ran PERFECT.
No lag, relatively high FPS, everything went great.
It's MP and other missions that just destroy the FPS.