20fps

I've been using this laptop for more than a month now. For all those who didn't know, it has a dedicated 1GB ATI Radeon 7670 graphic card and an inbuilt HD4000 onboard card Problem is, 7670 is supposed to run most of the games in medium settings(as far as i've heard). Still, why do i get only...

i have i915 . and 1024mb ddr333. pop ww is giving only 2fps while doom3 gives 20fps ? why ? solution ? THANX in advance