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Crucial X6 4TB vs Lexar SL660 2TB — Which External SSD Is Faster & Better Value?

Compare Crucial X6 4TB and Lexar SL660 2TB side by side. Both are 4TB USB 3.2 Gen 2 external SSDs, but they differ in speed, design, and value. Here's how they stack up.

Crucial

Crucial X6 4TB

8.2/10

A 4TB external at the X6's price is closer to spinning-rust economics than to typical SSD pricing. The 800 MB/s cap doesn't matter when the use case is video archive or photo-library cold storage — this drive is bought for capacity first, speed second.

4TB at budget-friendly price

PS5/Xbox cold-library compatible

Cool-running

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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

Crucial X6 4TB

Lexar SL660 2TB

Read Speed

800 MB/s

2.0 GB/s ✓

Write Speed

800 MB/s

2.0 GB/s ✓

Capacity

4 TB ✓

2 TB

Interface

USB 3.2 Gen 2

USB 3.2 Gen 2x2

Endurance (TBW)

2,400 TB ✓

1,200 TB

Warranty

3 Years

Score

8.2/10

Total Wins

2 wins

Frequently Asked Questions

Which is better, Crucial X6 4TB or Lexar SL660 2TB?

Both drives score 8.2/10 in our expert testing. The best choice depends on your specific needs.

What's the difference between Crucial X6 4TB and Lexar SL660 2TB?

The key differences: The Crucial X6 4TB offers 800 MB/s reads vs 2,000 MB/s for the Lexar SL660 2TB. Capacity options differ: Crucial X6 4TB is 4TB while Lexar SL660 2TB is 2TB. The Crucial X6 4TB uses USB 3.2 Gen 2 while the Lexar SL660 2TB uses USB 3.2 Gen 2x2.

Which is faster, Crucial X6 4TB or Lexar SL660 2TB?

The Lexar SL660 2TB is faster with 2,000 MB/s read speeds compared to 800 MB/s for the Crucial X6 4TB. That's a 150% speed advantage.

Which has better value, Crucial X6 4TB or Lexar SL660 2TB?

Both drives score the same in our evaluation. Consider features, endurance, and warranty to determine which suits your needs better.

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