Mining Performance -
Sooo, you don't actually know how to detune the CPU, or? Hint - toggle that "advanced control" slider to ON.
Power efficiency is poor as expected. Meh. That tiny chainsaw whacked off a few too many CUs.
And if you knew how AMD's drivers and tuning section work, you'd understand that toggling that "advanced control" slider just changes the percentage into a MHz number. Hint - toggle the "condescending tone" slider to OFF.
But I did make an error: I was looking at the memory clock, not the GPU clock, when I thought the GPU was still running at 2.13GHz. I've done a bit more investigating, now that I'm more awake (it was a late night, again — typical GPU launch). With the slider at 40% (which gives a MHz number of something like 1048MHz), I got nearly the same mining performance as with the slider at 65% (1702MHz). Here are three screenshots, showing 40%, 50%, and 65% Max Frequency settings (but with advanced control ticked on so you can see the MHz values). This is with the Sapphire Nitro+, so the clocks are slightly higher than the reference card, but the performance is pretty similar (actually, the reference card was perhaps slightly faster at mining for some reason — only like 0.3MH/s, but still.)
I've updated the text to remove the note about the max frequency not appearing to work properly. It does, my bad, the description of the tuned settings was and is still correct: 50% Max Freq, 112% power, 2150MHz GDDR6, slightly steeper fan curve, 115-120W.