I have been having some artifacting playing games with my Sapphire X800 XT PE. I found that it stops occurring when I underclock my ram to 500 mhz with ATI Tool. ATI Tool is also reporting extremely high temps. I assume there is a problem with the temp probe because it is reporting temps of 80+ degrees Celsius. If I play long enough even with the vram underclocked substantially the artifacts eventually return to a lesser extent. Do you think this is a cooling issue? If so would you recommend the Artic Cooling ATI Silencer 4 rev. 2 or the Zalman cooler or something else keeping in mind that memory cooling is important. If you suspect its the vram itself is there anything I can do. Also if you need any more info feel free to ask.