If anyone is still troubled with a stable overclock on their V56, I just thought I would log in to post my settings. My settings seemed to help a few people out several months ago. I was a tad higher those few months ago, but the settings somehow became a little unstable over time (driver updates maybe)?...Vega 56 Pulse.
Currently
MV State 0 - N/A, 1 - 900, 2 - 950, 3 - 960, 4 - 970, 5 - 980, 6 - 1015, 7 - 1020
Power limit set to 15%
HBM overclocked to 945Mhz
GPU-Z shows 1637Mhz clock, most games result arround a max of 1560-1600MHz.
Max fan set at 75% at 72 degrees c.
Furmark stress max temps are - 70c GPU, 98c hot spot, memory 78c, GPU VRM 89c, SOC VRM 89c, Mem VRM 87c with 210 watt power draw. All well within specification.
https://www.techpowerup.com/vgabios/194726/194726
I read a samsung data sheet a while back that stated their HBM starts to throttle at 80c.