All my tests ended up in 2016/2016 being the best value.
Tried 1 2 3 4 and even 6 threads. Tried combinations of those thread intensities with worksizes of 4 8 and 16. None has beaten dual 2016, but it matters little when after 1 minute you are mining bellow a V56.

But even with the min fan speed at the MAX (4500RPM) the memory quickly goes above 70º (in less than a minute) and the hash quickly drops from 2100 to 1700ish, sometimes to even lower values down to 1450...

The blower is either not as good as the RX counterparts or it's the 1600MHz without underclock that are contributing for the massive temperature increase in a matter of seconds.

All P-States are unlocked via overdriveNtool. Tried the same core/voltages as in the 64 and the result got worse in hash with the same thermal issues.

Bottom line seems to be: If you ordered it to mine, try to cancel/resell it and get a 56 or 64 instead.