And then when someone tries to make a estimation using Fury X "you can't, different uarchs, IPC gains" list goes on.
¯\_(ツ)_/¯
We are saying at worse case its a die shrunk Fiji @ 1600 clocks vs 1050. Same amount of core shaders, rops, etc from what we've seen from the specs so far. We know the power usage is under 400w let alone 500w and we've already seen very good performance from it as well.
Do you honestly expect there to be lower IPC on Vega over Fiji??