yeah that 1.40ghz processor isnt going to do much even if it is a quad core. that graphics card isnt the best either just beacuse its a 6xxx series doesnt mean its the best, the 6 in 6520 is showing what generation then the 520 shows the performance. i believe it goes from 6450-6990. anything before 6770 isnt gaming material. if anything it could be the drivers, but most likely its what the guy above me said, about Arma2 not being optimised. i have a i5 2500k OC@3.7ghz, raedon 6950 twin frozr iii OC'd, 8gb of corsair vengance @1600mhz and i get 45-60fps with the game on high, and this beast has ran everygame but Arma2 maxed with more than 90+ frames. if you dont already you can try to install the free version of Arma because it was lower resolution graphics, besides that i cant help you.