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I am using a MacBook Pro Touch Bar with latest OSX. To it I connected two Vega 64 cards in an external Akito external GPU case. I am getting consistent hash rate of 1,100 H/s on each card mining Electroneum. I shoudl check on XMR as well, not sure if it will be the same.
Everything is stable, though, I would like to bump up the hashrate to what I see on Windows ~1900... will keep experimenting.