TL;DR: Will a Samsung 960 Pro SSD fit in a Sonnet Thunderbolt 3 enclosure, and would you choose it over the LaCie Bolt3? I'm planning the mother of all set-ups. I'm hoping for new iMacs to be released soon that will support two external 5K displays, to make 45 million pixels of awesomeness. Such a system deserves the fastest external storage in the world. Do I need it? No, not at all - but it would be cool, and today's blazing fast drives are tomorrow's mediocre ones, so it's good to future proof. The LaCie Bolt3 looks to be the obvious choice should the budget allow: Up to 2800MB/s read Great design £1999 But, I've read that LaCie/Seagate hasn't got the best reputation for reliability, and I assume it's completely un-upgradable. Meanwhile, Sonnet has released new Thunderbolt 3 PCIe enclosures that are Mac compatible: here and here for around £200-300 (they're not available in the UK yet but I assume they will be soon). And Samsung now has the 960 Pro SSD: Up to 3500MB/s read Up to 2100MB/s write £1150 Could I just plonk one of those into the Sonnet Thunderbolt 3 enclosure and have 2TB of up to 3500MB/s, future-upgradable storage, for less than the cost of the LaCie drive? If so, which would you choose? Thanks!