Temperatures are ok - not more than 70°C. With 100% fan about 55°C but still artifacts. More power didn't help too. Welp, I thing I can't fix it, so i'll build a small miner with this card ;D
Since today I have artifacts in all DirectX games. Here is an example how it looks in Star Citizen: http://i.imgur.com/D2vW1Un.jpg It is hard to see in this picture but those artifacts are flickering very heavy.
One thing I noticed is, if I underclock my gpu core clock -300 MHz with MSI...