Problems in each game?(every game?)
Sounding more like a system problem.
As you have finally posted sys.specs.in sig.,any O.C.(cpu/graphics card).
Maybe leftover driver files from previous card.
win 7(sp1?)fully updated.
What game settings?
Regular disc clean/defrag?
How many Apps.(running at same time),up to date.
Is your system legit?
If you have been running beta drivers,have you completely removd all traces of them,before installing whql.
One thing i always do when installing a new card is remove existing drivers,then instal drivers from disc supplied with new card,run it for a few days,then update to newer drivers if needed.
I have only recently updated to 13.12 drivers(no probs),i don't need 14.4.
I think you need to check/clean/re-instal your system,or unfortunately you may have a bad card.
i5 3570k(@4.5)./ga-z77x-ud5h-wb./hyper T4./2 x 4gb vengeance 1600 c8./sapphire dualX 7970 3gb OC boost v2./1tb WD FAEX Black./lg bh10 blu-ray r.w../corsair hx850./antec df30./z506 spkrs./lg e2240v./win 8(8.1) pro x64