hi guys 
i bought 7970 video card with ghz edition form a week i expect its powerfull than 680 gtx  but  in some heavy game like crysis3 on 1920*1050 and  all setting is very high the fps go lower than 30 some time reach to 20 fps and tomp raider  the fps range 40 but in videos reach to 25 
my system esp:
gigabyte h67m d2 b3 ( pci express 2.0) 
ram: 8g corsiar 
cpu: i5 2400
gpu : 7970 ghz ( pci express  3.0)
ati driver : 13.3 
should i sent the card to warranty ??