Games lagging on my new radeon hd 6750?

i brought a few days ago and all the games are just lagging
before i had 9500gt gpu and i replaced it with hd 6750
i have formatted my computer and installed the latest drivers 12.4
i have 4gb ddr3 ram
550w corasir psu
asus mobo
core 2 duo processor
500gb hard disk

i have connected the 6-pin power cable
i have tried all the softwares to spped up my games

previously on 9500gt games were completely smooth
please help!!!!!!1
any help provided would be appreciated
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  1. reposting will not help people answer your question. Don't do it. The specific subsection of the graphics and displays forum isn't very important and certainly not worth posting again.
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