Best 4TB PCIe 4.0 Western Digital SSDs
There are 4 4TB PCIe 4.0 Western Digital SSDs compared here. The fastest is the Western Digital Black SN850X at 7300 MB/s read at 4TB. Sequential reads across the group span 5500–7300 MB/s at 4TB.
Why this configuration
A 4TB PCIe 4.0 Western Digital SSD is a mainstream Gen4 pick. Gen4 is the current default NVMe tier: about 7,000 MB/s, widely supported, and priced for volume. Western Digital specifically tends to be chosen here for its firmware track record and warranty support.
4TB starts to replace juggling several smaller drives.
Usually chosen for: most modern desktop and laptop builds.
Good fit: large libraries and archives on a single drive.
Ranked list
Speeds on this page are the manufacturer's 4TB ratings where published (4 of 4 drives), not the family headline figure. Rated writes at 4TB run 5000–6900 MB/s.
| # | Model | Tier | Controller | Read MB/s (at 4TB) | TBW | |
|---|---|---|---|---|---|---|
| 1 | Western Digital Black SN850X 1TB, 2TB, 4TB, 8TB | High-end | WD 20-82-20035-B2, WD 20-82-000292 | 7300 | — | Check price on Amazon |
| 2 | Western Digital Black SN7100 500GB, 1TB, 2TB, 4TB | Mid-range | SanDisk Polaris 3 | 7250 | — | Check price on Amazon |
| 3 | Western Digital Blue SN5100 500GB, 1TB, 2TB, 4TB | Mid-range | Polaris 3 | 7100 | — | Check price on Amazon |
| 4 | Western Digital Blue SN5000 500GB, 1TB, 2TB, 4TB | Value | WD Polaris 3 | 5500 | — | Check price on Amazon |
The parts, explained
4TB handles big Steam libraries, video projects and archives.
PCIe 4.0 x4 delivers roughly 7,000 MB/s, the current price-to-performance sweet spot for most builds.
Staying with Western Digital means consistent firmware, tooling and warranty handling across the range.