I have a MSI GTX 970 G4. When I overclocked it using MSI Afterburner, I found something strange; If I increased the voltage by 20, the voltage would jump to 1.2370. I increased it up by 35, the voltage stayed the same at 1.2370 according to gpu-z. But I found out that at +20, the voltage would stay at 1.2370 during Heaven, then drop. At +35, the voltage would stay at 1.2370 the entire time. At +37, the voltage would jump to 1.2620. Is this normal?