Hi,I am using the hd7970 matrix platinum.I used to had some artifacts on games but after reduce the memory voltage and speed now is stable.The other problem that I have is when I turn on my computer the voltage of the GPU in asus GPU TWEAK app it's show 336mv.If I try to play a game then it crash.Then I need to restart my PC.Then the voltage is set to 1400mv after the restart.I manually set it to 1257mv which is the default and everything is fine.In summary I need to make a restart once i turn on the pc in order to set the voltage to 1257mv. Can you help me with this problem? Thanks