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iMac 5K Flash Drive (SSD)
MPG has a 1TB Apple SSD in the Mac Pro, and a 1TB SSD in the iMac 5K.
Disk I/O speed is the culprit.
Mac Pro: writes at ~930 MB/sec and reads at ~1180 MB/sec.
iMac 5K: writes at ~716 MB/sec and reads at ~766 MB/sec.
The flash drive in the iMac 5K is a two-lane device. With each PCIe lane delivering 500 MB/sec but with ~20% overhead, peak speed is thus limited to ~800MB/sec (theoretical) for the iMac SSD (the Mac Pro allocates 4 lanes).
$2699 SAVE $1600 = 37.0% Apple 15.4" MacBook Pro with Touch Bar (Late 2016, Space Gray) in Computers: Other
$4599 SAVE $300 = 6.0% Apple 27" iMac Pro with Retina 5K Display (Late 2017) in Computers: Apple Macs
$108 SAVE $55 = 33.0% Samsung 500GB T5 Portable Solid-State Drive (Blue) in Computers: Drives and Storage