VEGA64 has a 300W TDP and can pull over 400W underload.
The Xeon-W has a TDP of 140W and can pull 200W under load.
Add in cooling, most radial fans are 4-6A @ 12V which means they can pull upto 80W.... The Delta radial fan on the Vega 64/56 air pulls 60W on it's own at full speed.
High end motherboards consume 40-80W, memory also will consume about 5W per DIMM.
And you have the built in screen which can easily consume 200W or more at peak brightness.
So I hope you have a tasty hat, because there is no way that the iMac Pro isn't coming with a near 1kW PSU.
I have a 2017 loaded iMac, i7 (TDP 90W), Radeon 580 (TDP 150W). Fans etc, abound.
It's certainly not the same, but the built in screen definitely does not consume 200W, and though I can't determine the raw number, going from 'dimmest' to 'brightest' increases power draw 70W.
Guess what size PSU all of the above comes with? 310W.
We shall see. I actually really like the iMac Pro, and would enjoy having one, I don't want to see it fail, I'm just struggling to see how you're getting more than three times the heat dissipation load in what they say is the same 'body size'.
The Xeon-W has a TDP of 140W and can pull 200W under load.
Add in cooling, most radial fans are 4-6A @ 12V which means they can pull upto 80W.... The Delta radial fan on the Vega 64/56 air pulls 60W on it's own at full speed.
High end motherboards consume 40-80W, memory also will consume about 5W per DIMM.
And you have the built in screen which can easily consume 200W or more at peak brightness.
So I hope you have a tasty hat, because there is no way that the iMac Pro isn't coming with a near 1kW PSU.