I am using ATI Radeon HD 4870 video card on my dell computer from the last months. In the starting it don't have any problem. Now I am having some problem with it. While playing games like FUEL and Call of Juarez 2 Bound in Blood I get lots of artifacts. Sometimes color changes and sometimes VPU resets. I also have problem with GPU MemIO. It overheat around 80 °C while playing game. Please help me to fix ATI Radeon HD 4870 Artifacts problem.