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Re:Blackmagic eGPU – Thunderbolt 3 external graphics processor by itsdrewmiller on Friday July 13, 2018 @02:39PM (#17525574)
SATA SSDs are not top of the line - a 4TB nvme card is more like $3k:

https://www.amazon.com/HighPoint-rSSD7101A-4TB-NVMe-Drive/dp...

The samsung SSDs have about 15% the read speed Apple is advertising.

Re:Blackmagic eGPU – Thunderbolt 3 external graphics processor by Zephyreks on Friday July 13, 2018 @03:20PM (#17525873)
Compare the HP EX920 (1TB for $300 on sale) to the SSD in the... 15" MBP 2017, or something.

HP EX920: http://www.legitreviews.com/wp-content/uploads/2018/04/hp-ex...

Apple: https://www.notebookcheck.net/fileadmin/Notebooks/Apple/MacB...

Same AS SSD benchmark.

Now you can argue that since SSD performance increases with size, maybe that's why. Then prove it.