My rig have 6 rx588(samsung)
gpu freq 1200 mem 2100
voltage is 940 on gpu and mem
That's probably they did not yet impmeneted vddc voltage settings.. Do you use those parameters in claymore?
I use this params directly in bios. And when i use phoenixminer i run OverdriveNTool. All freq and voltage display like i wrote in bios. MSI AB give information like i wrote.
I get same power consumption from wall on both Phoenix and Claymore. There should be something messed up with settings on yours.
p.s. I use an energy meter from the wall so I know the readings are accurate.