When I was looking how to decrease consumption I found two things really weird.

One of my rig is reporting a huge diference between reported hashrate and pool hashrate . ( No hw error etc..)
https://imgur.com/a/In6q2S4
There is no error and there is 2 kh/s between pool hashrate and reported hashrate.

The second thing is even weird:

This is my PPT for my Vega 64:
https://imgur.com/a/NTuNGjT

P0->p6 core are disable and P0->P2 mem too  and for the last state I use 875mV but when I check HWinfo when mining voltage is still around 895 mV.

Look like it use the higher voltage of disable state when running.

So I try to change my PPT by using 820mV for all state except the last one for core and mem.
I keep the exact same P7 core and P3 mem but my card is reporting dead almost one min after starting to mine.

Any explanation ?