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Up to 1527MB/s sustained performance
877-865-7002
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OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ No more slow and noisy hard drives!

Promise Pegasus J4 — SSD Speed (Compressible)

Last updated 2013-07-03 - Send Feedback
Related: diglloydTools, SSD, storage, Thunderbolt

Tested on the 2.7 GHz MacBook Pro with Retina display, which has a Thunderbolt connector. This test is for compressible data.

Update: see issues.

Sustained transfer speed — compressible data

The Thunderbolt v1 bus speed effectively throttles peak performance to just under 900 MB/sec for reads. Observe that 2/3/4 drives striped all effectively perform the same for reads of compressible data.

Since read activity dominates most workflow scenarios, it is fair to say that even two OWC 6G SSDs in this Pegasus J4 will provide enviably robust performance.

Write speeds are lower, and this appears to be a Thunderbolt or Pegasus limitation, because write speeds on a native SATA 6Gbps connector approach 500MB/sec for a single SSD.

But none of that really matters: the speeds with even two SSDs are well beyond the ability of nearly every program to use the high speed in any meaningful way. Even Photoshop CS6 sees greatly diminished returns after ~600MB/sec.

For compressible data, the sweet spot for reads and writes is the triple-SSD configuration, which leaves that 4th bay free for a high capacity hard-drive utilized as a clone backup.

Tested with diglloydTools DiskTester using the fill-volume test.

RAID-0 stripes of 2/3/4 SSDs + single SSD
(Data from diglloydTools DiskTester data graphed from fill-volume test)
RAID-0 stripes of 2/3/4 SSDs + single SSD
(diglloydTools DiskTester data graphed from fill-volume test)
OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
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