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OWC Envoy Pro FX 2TB vs SSK PM510 USB4 1TB

Compare OWC Envoy Pro FX 2TB and SSK PM510 USB4 1TB side by side. Both are 2TB Thunderbolt 3 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Our Pick

OWC

OWC Envoy Pro FX 2TB
8.8/10

The 2TB Envoy Pro FX keeps the same small unibody of the 1TB but scales the die stack. The sustained write behavior on the 2TB stays pegged at 2800 MB/s well past 500GB on a Thunderbolt 3 host.

Thunderbolt 3 2800/2800 MB/s
Sustained writes hold past 500GB on 2TB
Aluminum unibody
Check on Amazon →

SSK

SSK PM510 USB4 1TB
8.6/10

AUSB4 portable at enthusiast-grade specs — 3200 MB/s read over USB4 / Thunderbolt 4 hosts. The PM510 is one of the more affordable USB4 portables, an entry point for video editors who need Thunderbolt-class speeds but don't want to pay LaCie or OWC premium.

USB4 3200 MB/s
Thunderbolt 4 compatible
Aluminum body
Check on Amazon →

Spec Comparison

Spec
OWC Envoy Pro FX 2TB
SSK PM510 USB4 1TB
Read Speed
2.8 GB/s
3.2 GB/s ✓
Write Speed
2.8 GB/s
2.8 GB/s
Capacity
2 TB ✓
1 TB
Interface
Thunderbolt 3
USB4
Endurance (TBW)
1,200 TB ✓
600 TB
Warranty
3 Years
3 Years
Score
8.8/10 ✓
8.6/10
Total Wins
3 wins
1 win

Frequently Asked Questions

Which is better, OWC Envoy Pro FX 2TB or SSK PM510 USB4 1TB?
The OWC Envoy Pro FX 2TB scores 8.8/10 compared to 8.6/10 for the SSK PM510 USB4 1TB. Our expert analysis favors the OWC Envoy Pro FX 2TB for its superior value.
What's the difference between OWC Envoy Pro FX 2TB and SSK PM510 USB4 1TB?
The key differences: The OWC Envoy Pro FX 2TB offers 2,800 MB/s reads vs 3,200 MB/s for the SSK PM510 USB4 1TB. Capacity options differ: OWC Envoy Pro FX 2TB is 2TB while SSK PM510 USB4 1TB is 1TB. The OWC Envoy Pro FX 2TB uses Thunderbolt 3 while the SSK PM510 USB4 1TB uses USB4.
Which is faster, OWC Envoy Pro FX 2TB or SSK PM510 USB4 1TB?
The SSK PM510 USB4 1TB is faster with 3,200 MB/s read speeds compared to 2,800 MB/s for the OWC Envoy Pro FX 2TB. That's a 14% speed advantage.
Which has better value, OWC Envoy Pro FX 2TB or SSK PM510 USB4 1TB?
The OWC Envoy Pro FX 2TB scores higher (8.8 vs 8.6/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

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