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any help would be great

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Ive just upgraded my PC by adding new mem which is cas 2 the old one was cas3 and a new psu 550W old one was only 350w
thing is i thought i would get at least 100 maybe pushing 200 more in 3dmark05
but on stock speeds im down on my old score and it just the same when i oc my grx card ,still down on old scores ?
i tired all sorts of fixes but still cant get it any better than the 6900 i got with my old stuff ?
so i was wondering if there's anything else i had to do ?
as i said any help would be nice as i would love to break 7000

btw that Sandra program wont run anymore, keeps saying its got some error even after i reinstall it? before the upgrade it worked fine