![]() 2015 MacBook Pro SSD is very good, but has roughly 2/3 the speed of the 20 models.2017 MacBook Pro handily beats even the 2017 iMac 5K by a good margin for 1MB or smaller I/O sizes.MPG deems it the best because It offers significantly better performance with 256K, 512K and 1M transfer sizes. 2017 MacBook Pro SSD speed is the reigning champion as of mid 2017.The 2017 MacBook Pro (solid lines) shows the best performance of all: better than previous MacBook Pros, and quite a lot better than the 2017 iMac 5K (gray lines), particularly on reads and writes less than 1MB in size, which are critically important sizes for most applications. The graph below shows performance for read and write for transfer sizes from 32K to 512MB. Tested with the run-sequential-suite command of diglloydTools DiskTester. Numbers for the 2016 MacBook Pro were obtained with macOS 10.12.1 numbers for the 2017 MacBook Pro and 2015 MBP and 2017 iMac 5K were all obtained on macOS 10.12.5. Otherwise the 2016 model and the 2017 model are the same speed in practical terms. ![]() The main difference is that the 2017 MacBook Pro offers higher speeds for 256KiB, 512KiB and 1MiB transfer sizes. ![]() Jaw dropping performance! This is insanely fast, and even a little better than the 2016 MacBook Pro SSD, which was the previous speed record holder. The SSD performance of the 2017 MacBook Pro is the best MPG has ever tested in a Mac as of mid 2017. MPG tested a fully-loaded 2017 MacBook Pro with 1TB SSD. Suggested accessories include the OWC Thunderbolt 3 Dock and 1TB Envoy Pro EX. MPG gets credit if you buy through those links.Send Feedback Related: 2016 MacBook Pro, 2017 iMac 5K, 2017 MacBook Pro, 4K and 5K display, computer display, iMac, iMac 5K, laptop, MacBook, MacBook Pro, Macs, SSD
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