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Crucial X9 Pro 1TB vs SSK PM510 USB4 1TB — Which External SSD Is Faster & Better Value?

Compare Crucial X9 Pro 1TB and SSK PM510 USB4 1TB side by side. Both are 1TB USB 3.2 Gen 2 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Our Pick

Crucial

Crucial X9 Pro 1TB

9.0/10

A 1050 MB/s portable SSD for creators who need TLC NAND, hardware encryption, and a 5-year warranty at less than Extreme Pro prices. The X9 Pro is Crucial's premium Gen 2 line — it targets direct-edit workflows where sustained writes and write endurance matter more than headline speeds.

Real TLC NAND (not QLC)

5-year warranty

AES 256-bit hardware encryption

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

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Spec Comparison

Spec

Crucial X9 Pro 1TB

SSK PM510 USB4 1TB

Read Speed

1.1 GB/s

3.2 GB/s ✓

Write Speed

950 MB/s

2.8 GB/s ✓

Capacity

1 TB

Interface

USB 3.2 Gen 2

USB4

Endurance (TBW)

600 TB

Warranty

5 Years ✓

3 Years

Score

9.0/10 ✓

8.6/10

Total Wins

2 wins

Frequently Asked Questions

Which is better, Crucial X9 Pro 1TB or SSK PM510 USB4 1TB?

The Crucial X9 Pro 1TB scores 9.0/10 compared to 8.6/10 for the SSK PM510 USB4 1TB. Our expert analysis favors the Crucial X9 Pro 1TB for its superior value.

What's the difference between Crucial X9 Pro 1TB and SSK PM510 USB4 1TB?

The key differences: The Crucial X9 Pro 1TB offers 1,050 MB/s reads vs 3,200 MB/s for the SSK PM510 USB4 1TB. Capacity options differ: Crucial X9 Pro 1TB is 1TB while SSK PM510 USB4 1TB is 1TB. The Crucial X9 Pro 1TB uses USB 3.2 Gen 2 while the SSK PM510 USB4 1TB uses USB4.

Which is faster, Crucial X9 Pro 1TB or SSK PM510 USB4 1TB?

The SSK PM510 USB4 1TB is faster with 3,200 MB/s read speeds compared to 1,050 MB/s for the Crucial X9 Pro 1TB. That's a 205% speed advantage.

Which has better value, Crucial X9 Pro 1TB or SSK PM510 USB4 1TB?

The Crucial X9 Pro 1TB scores higher (9.0 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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