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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More about games lagging radeon 6750
  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.
    http://www.tomshardware.com/forum/351916-33-games-lagging-radeon-6750
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