I get no artifacts ever. I had already cleaned off the paste and applied AS5 a few months ago. When I first did it My idle was mid 50s and load was high 70s in the same case I am using now.
If I cant fix this I have considered getting a new card with a rear exhaust or getting a motherboard with an onboard sollution. I know my G31 chipset would not work but I have had friends tell me the 9400 works well enough for 1080p and gaming on medium settings.
In case anyone requires proof.http://www.flickr.com/photos/37834615@N07/3840968243/