Possible artifacting? ... assuming this is during gaming...try lowering the graphics settings and seeing if it still shows up.
Nah this happens all the time, gaming, or desktop, it doesn't matter.
My graphics card runs great. no problems at all, stable oc. Even without the oc these lines show up.
Like I said "This started happening when I updated from 301 drivers to 310.90 drivers". 301.42 drivers work fine, no lines. Except Farcry 3 is choppy, performance is improved after 310.64, but then the lines pop up.
I'm just wondering if anyone else has encountered this, and if they figured out how to fix it.