The Western Digital WD Black SN850X 2TB wins in 4 out of 7 comparable specs. Its biggest advantage is DRAM Cache (100% better).
WD Blue SN5000 4TB wins in 1 spec (Capacity: 100% better).
Recommendation
Choose WD Black SN850X 2TB if you want the best overall performance — especially dram cache.
Choose WD Blue SN5000 4TB if capacity matters more to you.
| Spec | Western DigitalWD Black SN850X 2TB | Western DigitalWD Blue SN5000 4TB |
|---|---|---|
| Storage | ||
| Capacity | 2000 GB | 4000 GB+100% |
| Type | NVMe SSD | NVMe SSD |
| Interface | PCIe Gen4 x4 | PCIe Gen4 x4 |
| Form Factor | M.2-2280 | M.2-2280 |
| NAND Type | TLC | QLC |
| Performance | ||
| Sequential Read | 7,300 MB/s+33% | 5,500 MB/s |
| Sequential Write |
| 6,600 MB/s+32% |
| 5,000 MB/s |
| Endurance (TBW) | 1,200 | 1,200 |
| Features | ||
| DRAM Cache | Yes+100% | No |
| Platform | ||
| Controller | WD in-house | WD in-house |
| PCIe Gen | 4 | 4 |
| Price | ||
| MSRP | $140−30% | $200 |
| Release Date | Aug 2022 | Jun 2024 |
