Apparently an Apple design trend, in a disappointing direction.Īll in all, very disappointing-for most uses reads are far more important than writes. Look at how the 2017 iMac 5K SSD performs at 32/64/128K reads (green dashed line), and yet the 2017 iMac 5K SSD is itself slower than the 2015 iMac 5K SSD for small transfer sizes. Apple ought to go back to Samsung SSD modules instead of designing its own. It is gobsmackingly laughingly inappropriate for a pro machine. Indeed, the iMac Pro 32K read performance is little different from the 12TB Seagate Helium hard drive and its 64K read performance is only moderately better than the hard drive. Which in turn underperforms its 2015 predecessor. The 2017 iMac Pro impresses mightily with its write speed, but what matters most of all for most applications is read speed of 32K, 64K and 128K transfers and with small reads the iMac Pro underperforms its consumer sibling. disktester run-sequential-suite -test-size 8G Real world speeds through the file system using diglloydTools DiskTester. Sustained transfer speed vs transfer size
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