The blue horizontal stripes seem to only be a problem with the ATI 69xx cards.
Whether it is the game or a driver issue it is still unknown.
On another note, a very well done, week long,scientific test by TXgunslinger determined the microstutters were caused by the cpu and not the video card.
"In summary - It's the CPU not the GPU that producing the stutter and pausing."
http://forum.1cpublishing.eu/showthr...=TX-gunslinger