Upgrading your RAM from 2 to 4 would be more than sufficient, and you have win7 which is a plus. Your GPU is good and your CPU is quite good too. The fact that is a dual core CPU is perfect for DCS now. But DCS is also a RAM eater. Upgrading to 4 GB will reduce crashes to a minimum and increase fps dramatically. Its also a plus that you got a DDR3 support mobo.