He's way lowballing some of his assumptions.
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For example, he lists the Radeon RX580 as $200, but the Mac Pro has a Radeon RX580Pro with special Mac-specific firmware, which I cannot find for less than $350. Also, the version Apple is using is passively cooled, which nobody sells out of the box. But you can buy a passively cooled backplate for it, which runs an additional $150.
So the video card alone he assumes costs $200, but it would actually cost $500.
As another example, there is no way a generic EATX chassis would come close to comparing to the Mac Pro chassis, and its cooling system. Apple says the new Mac Pro runs at less than 10db, how much is that worth to a buyer? I don't know of any comparable cases, but other top of the line well-engineered cases easily cost $500+. Same with the PSU - I highly doubt a $300 PSU will be as quiet as Apple's. Passively-cooled high-watt PSUs are very expensive.
Where is Thunderbolt 3? Where is the latest Xeon processor that has not even shipped yet? Where is the 63,040 mps PCIE interface bus with thunderbolt 3 support not 15760 meg per second bus? and Bluetooth 5.0?
Hmm does not seem the same to me?
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