I didn't bother with mem voltage because I was able to get temps down to 90C which I'm OK with because there isn't much thermal cycling. I'm running 1230 core @ about 735 (varies based on silicon lottery), 1780 mem but I BIOS modded the 1550 Hynix straps for tighter timings, I was able to get same MH/s with lower ram speed, 54MH/s at pool end, 105W per Phoenix. I didn't bother to measure at the wall because I was in a hurry to get sustained uptime over profits.

The tighter timings allowed me to clock the RAM down to 1780 and still get a good rate. When we get our 3 days of winter here in Los Angeles I'll bump the memory up a bit, but for now this is the best I can get when we have ambient above 90F everyday.