Ok testing with vega 56. It really seems to be a power limit problem. With no real tweaking, just power limit on a stock 56 GPU, I get.
190w -19pl, 1300
235w 0pl, 1450
So, yes PL + 50 will get you good speed...but at an ridiculous power usage. This is stock 56 though, not soft modded.
Agreed, my watercooled Vega64 at stock clocks takes 500W to show 2200KH/s, it's crazy. Though it takes similar power in dual mining too.
vega has to be softmodded with power play table mod to reduce power or itsa hog
all my vega 56 and frontier cards are softmodded and do 40mhs eth 2500 blake at around 200ish watts
Not tried neoscrypt yet tho with this new miner