In HwINFO, go to the settings section. Where you see the IC2 portion, put a check box in the #4 block and restart the program. Problem solved.
What happens is every time HwINFO polls for data, it causes a voltage drop in the GPU voltage, it does this about once a second and the GPU voltage drops then up then down then up etc etc. Unhealthy and causes instability.
Modify is about 0.1 volt over what you program in test.ini, so 1.25 is roughly 1.35 vcore to the gpu actual.
Enjoy.