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Up to 128GB for 2019 iMac 5K!
Up to 64GB for 2015/2017 iMac 5K
Save nearly 50% over Apple pricing
iMac 5K (Late 2015): Flash Drive (SSD)
Related: 2013 Mac Pro, 2015 iMac 5K, 4K and 5K displays, computer display, iMac, iMac 5K, Mac Pro, Macs, memory, SSD, video
Save money on 32GB or 64GB OWC memory (about $400 savings vs Apple!)
It’s worth paying for the Apple 1TB flash drive—wow!
Sustained transfer speed, large transfers
The late 2015 iMac 5K Retina has a stunningly fast flash drive (SSD) that trounces the flash drive in the 2014 iMac 5K.
2013 Mac Pro: writes at ~930 MiB/sec and reads at ~1180 MiB/sec.
(early 2014 build, 2015 builds may be faster)
2014 iMac 5K: writes at ~716 MiB/sec and reads at ~766 MiB/sec.
2015 iMac 5K: writes at ~1520 MiB/sec and reads at ~2080 MiB/sec.
One reader reports that the 2013 Mac Pro built in 2015 may have a faster flash drive than shown here—this seems likely but MPG has not confirmed it.
Sustained transfer speed vs transfer size
Transfer speed with 32K transfers is about 750 MB/sec, which is outstanding, and well beyond the bus speed of any SATA 6G SSD. Wow! It is also very important for many tasks which make small transfers (including file copying). But it gets even better: speed picks up even more with larger transfers.
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