What games are you experiencing flickering in? Flickering is a known issue for dx9 games with the 7000 series.
Dead space 3 gets black screen flickers, close to artifacts.
Crysis 2 and 3 get the occasional texture flicker.
Just played up til the second level where you get to the open field (Crysis 3) and it started to artifact bad.
Battlefield 3 is fine surprisingly..
Sigh.. I don't know what the hell is happening.. when the card was delivered to my house, they didnt actually tell me it arrived. So they left it out in the sun for a couple of hours. I dont know if that would damage the card.