hey i have a computer with the following specs;
AMD bulldozer quadcore 4.2GHZ CPU
AMD radeon 6450 GPU
8 GB DDR3 RAM
and im having problems playing games, even relatively old ones like fallout 3, on high settings and its annoying. so i was thinking should i just get an entirely new GPU or maybe get another 6450 and run them in crossfire?
You need a better graphics card. Crossfiring a 6450 won't buy you much performance since its not really meant to game. 6670 is the very low end of gaming cards but I suggest you go several notches up from there.