I have just installed a new HIS X1950 Pro Graphics Card in my system and I am getting artifacts in games (after about an hour) and in 3dmark06 (straightaway). I thought my Seasonic 500W PSU wasn't powerful enough so I upgraded to a Seasonic S12-650 650W PSU. This didn't solve the problem. So I now think it is either my CPU or Graphics Card overheating. According to ATi control center my graphics card temp is only 45C even after running 3dmark06. I have also just installed Speedfan and notice that my CPU temp goes up to about 78C (from 46C) when 3dmark runs. Just to see if cooling my CPU would do the trick I increased my Zalman Flower CPU Cooler fan speed and have not had any artifacts yet. So, is it because my previous card (an X850XT) was not pushing the system, and CPU, hard enough that I didn't get artifacts with that? Or could it still be a problem with my X1950 Pro? Many thanks for any help received.