Not figuring out your sweet spot voltage is why it drops down to 39. those voltage fluctuations have an impact on a fixed overclock. Have you run Prime for 12+ hours to see if it's actually stable?
I'm using an offset overclock. So when not under load like right now as I type, it sits at 1600mhz and when loading a bunch of web or playing it game I jump up to 4400mhz
I'm using an offset overclock. So when not under load like right now as I type, it sits at 1600mhz and when loading a bunch of web or playing it game I jump up to 4400mhz