Thunderbolt 2 speeds with fast SSD

Started 2 months ago | Discussions thread
jf_tea Senior Member • Posts: 1,466

Many new techno gadgets are *great* -- in theory.

I had a 500 GB Samsung EVO SSD (SATA) in a 4 bay OWC Thunderbolt 2 enclosure. I've used it at first with a 2011 27" iMac, with Thunderbolt. And, then with a 2015 iMac Retina, with Thunderbolt 2. Neither iMac had an internal SSD. So, I never did a external SSD to internal SSD copy. Reads from SSD to RAM were blazingly fast: starting an app or opening a RAW file. I think Activity Monitor did show reads peaking at about 300+ MB/s. Transfers from a HDD to the SSD (both in the Thunderbolt 2 enclosure) were at about 250+ MB/s (peak). And from SSD to HDD (HDD writes) the peak write speed was at 210 MB/s (large files to a 6TB or 10 TB HDD).

The internal SSD in my 2019 MBP 13 inch can do burst transfer about 10 times faster, but, this get to a bottleneck when transfering to anything outside of the MBP.

Also, don't plan too far in the future as technology changes quite quickly.

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