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External SSDs

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Corsair EX400U 1TB vs Lexar SL660 2TB

Compare Corsair EX400U 1TB and Lexar SL660 2TB side by side. Both are 1TB USB4 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Our Pick

Corsair

Corsair EX400U 1TB
9.0/10

A 1TB USB4 portable — 3300 MB/s read on a Thunderbolt 4 / USB4 host. The EX400U is the rare USB4 drive that supports the full 40Gbps link (not all USB4 drives do). 5-year warranty is best-in-class for the speed tier.

USB4 3300 MB/s read
5-year warranty
Full 40Gbps USB4 link
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Lexar

Lexar SL660 2TB
8.2/10

The 2TB SL660 doubles SLC cache budget over the 1TB. RGB and aluminum body preserved — a competitive Gen 2x2 2TB at moderate pricing. Worth comparing with the Kingston XS2000 2TB and Patriot Evlvr 2TB.

Gen 2x2 2000 MB/s
2TB storage
Aluminum body
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Spec Comparison

Spec
Corsair EX400U 1TB
Lexar SL660 2TB
Read Speed
3.3 GB/s ✓
2.0 GB/s
Write Speed
3.0 GB/s ✓
2.0 GB/s
Capacity
1 TB
2 TB ✓
Interface
USB4
USB 3.2 Gen 2x2
Endurance (TBW)
600 TB
1,200 TB ✓
Warranty
5 Years ✓
3 Years
Score
9.0/10 ✓
8.2/10
Total Wins
4 wins
2 wins

Frequently Asked Questions

Which is better, Corsair EX400U 1TB or Lexar SL660 2TB?
The Corsair EX400U 1TB scores 9.0/10 compared to 8.2/10 for the Lexar SL660 2TB. Our expert analysis favors the Corsair EX400U 1TB for its superior speed.
What's the difference between Corsair EX400U 1TB and Lexar SL660 2TB?
The key differences: The Corsair EX400U 1TB offers 3,300 MB/s reads vs 2,000 MB/s for the Lexar SL660 2TB. Capacity options differ: Corsair EX400U 1TB is 1TB while Lexar SL660 2TB is 2TB. The Corsair EX400U 1TB uses USB4 while the Lexar SL660 2TB uses USB 3.2 Gen 2x2.
Which is faster, Corsair EX400U 1TB or Lexar SL660 2TB?
The Corsair EX400U 1TB is faster with 3,300 MB/s read speeds compared to 2,000 MB/s for the Lexar SL660 2TB. That's a 65% speed advantage.
Which has better value, Corsair EX400U 1TB or Lexar SL660 2TB?
The Corsair EX400U 1TB scores higher (9.0 vs 8.2/10), indicating better overall value in our evaluation. Check both models on the retailer's site for the latest details.

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Corsair EX400U 1TB vs Crucial X10 Pro 2TB → Lexar SL660 2TB vs Crucial X10 Pro 2TB →
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