4927 @1080 extreme just now on my powersave setting. (I can push higher but that seems a good stable setting) Mine does a strange thing in that it seems to clock itself back after a crash it didn't like, so my bench scores suffer, dropping by about 10% or more, even though it's showing the same sort of clock speeds. After several boots of not crashing it pushes one, then the other bios back up and the scores start going back to normal. A steady 1620 core @ 1025mv sounds good. How do your actual gaming FPS seem? Mine seem to vary, depending on the mood of my card. I've used witcher 3 on 4k ultra settings (except crowds on high) for testing, simply because I know it - cantering through crowded streets seems to give 47-52fps, though sometimes it does 58-60 (my FRTC is set at 60hz - my 4k monitor doesn't go higher). Your mem sounds low - but if it's working well, it's working well. I found pushing mine to 1130 gave good bench scores but it's not stable in gaming. I'm assuming you have it at 1025/1000mv? If you have the voltage lower than that (yeah I know the mem voltage is set) try pushing it a bit more to see what effect it has. Having it at 950mv didn't work that well for me I remember.