Hello, I need some video card advice, a mate of mine snagged a free Q6600 system not overclocked, currently with 6gb ddr2 but will probably up to 8gb (is this necessary?). Not sure what motherboard he has but he currently has a GTS 250 and a 430w PSU. He only plays a few steam games like DoTA 2, CS:GO, TF2, mostly the free valve games and plays on a 1080p display. Any suggestions on a cheap upgrade on a graphics card? he wants to at least play game smooth with at least medium graphics if possible.