I
I flashed my first BIOS. Using the 1-click feature of a 1.6.7 Polaris editor.
Hashrate bumped from 22.5 to 28.225.
A solid 31.5 with all my card at 2250 MHz memory clock.
(Running two at a time because I'm still expecting my rig frame)
Still using 90-100 W per card, though: the undervolting is temperamental.