mines a bad brand (Grandmars - Taiwan) product with 275/530(DDR) speed

i dun get some high n stable fps in Battlefield 1942 with full on but i think a R9700pro will. why cant I do that (i got no AA or AF on)..

is it because i got a crap CPU?
bad chipset?
bad cooling (=ATI stock cooler)
increase voltage (to 1.6V?)