Hi
I have a GL703VM with latest ROG Gaming Center. I have tried to undervolt my cpu with XTU (-0.130) and ever since ROG Gaming Center shows 0 MHz for CPU. After reverting the undervolt, stop the XTU sensors, reinstalling Game Center, uninstalling XTU it still did not work. It only worked after I reinstalled the Game Center after removing XTU and any changes made with it to the CPU. So I conclude that there is a some strange interaction with the 2 programs.
Also Afterburner seems to not interact with it in any way. I did not use it for much though, just to show stats in game.