my question is i have amd radeon hd 6670 2gb ddr3 bought it 1 months ago my gta iv game was not running on high settings well between 15-20 fps everywhere was lag my cpu is core 2 due 2.8 ghz ddr2 ram 2gb and a ddr2 &ddr3 supported gigabyte motherboard but my friend just recently bought a second hand hd 5450 ddr3 1gb with 2gb ram and atom processor i dont know whats happening but in his system gta iv runs on ultra at arround 42 fps whats the matter my pc isnt so bad what should i do