So I fired up Counter Strike Source for a quick game. upon loading the whole screen was filled with flashing sparkles etc. I exited game and tried again with same result.
I took screenshot but it did not show sparkles.
So I loaded another game (soldier of fortune 3)and it worked fine
Graphics card: GTX 295.
Power Supply: 650W corsair
edit: I loaded up Day of defeat source and it was sparkling as well, same with the original half life.
nvidia monitor shows temperatures @ 50oc (I have fan on high).
Edit 2: and mirrors edge is shwoing the artifacting. 3Dmark06 is also artifacting and is showing this when I alt tabbed