Graphical issue

It seems to happen, when I spawn a few of NPC’s over time, not always at once
It doesn’t go away till I change map (Or just close the game all together)

I would say its my Video card over heating… but it doesn’t really look like artifacts.

http://img510.imageshack.us/img510/8012/gmexcessconstruct0000.jpg
http://img180.imageshack.us/img180/8885/gmexcessconstruct0001.jpg
http://img59.imageshack.us/img59/9444/gmexcessconstruct0002.jpg
http://img405.imageshack.us/img405/7946/gmexcessconstruct0003.jpg
http://img160.imageshack.us/img160/5083/gmexcessconstruct0004.jpg
http://img160.imageshack.us/img160/1530/gmexcessconstruct0005.jpg
http://img160.imageshack.us/img160/1339/gmexcessconstruct0006.jpg

That happens to me after long playing periods of graphically stressful situations. I would also like to know the answer.

It’s your graphics card overheating. Or seems to be.