I'm building my friend a PC, and the power supply I have is a Corsair CX430 430w power supply. Is there any low powered graphics cards I can get for under $40 (used) that would be equal to or better than an HD 6950 2gb? I need at least 2gb of vram, but other than that, I just need it to be at least equal... or maybe slightly worse... than an HD 6950. Thanks!