Fan settings are important btw.  With my settings the cards only hit ~56C while HBM2 mem is 70+.  Manual fan settings required.  I use 3100 RPM.

Yeah I am positive I can go a bit lower.  I wanted a stable base before I shot for the moon.  Next iteration on the rig now that I know these settings are stable I was thinking of 910mv.

I had my mem running at 1100 but for an extra like 10H per card I felt it wasnt necessary given the extra heat.   I'll be plotting results and optimizing this once I have more data.