I don't know what the problem is called... but you can see in the image attached. I bought Radeon HD 7870 Sapphire OC Edition 2GB some time ago. First it gave me the famous restart problem. I solved it by changing my PSU. Easy stuff. But since then it's given me another problem: artefacts or screen tearing or flickering... I don't even know what's this. At first I thought the problem was from the screen. It was not, I tested it with another screen and same problem happened. Then, the graphics card. It's not, I changed from a 7870 to a 7850 and the problem remains. What can I do? Help me please.