WD_BLACK SN850X 4TB
WD · 4 TB · NVMe PCIe 4.0 x4 PCIe 4.0 · High-End
At a glance
Key specs for WD_BLACK SN850X 4TB at a glance — open the Specifications section below for the full table.
How we score
We build each score from the same spec sheet data for every SSD in our catalog, so you can compare drives fairly — there are no editorial thumbs-up or thumbs-down behind these numbers.
- Play (0–100) — How strong this drive looks for gaming: loading games, patching, and pulling in big game assets quickly. Higher usually means snappier load screens and less waiting.
- Work (0–100) — How well it suits heavy desktop work — saving and moving huge files, editing video, and other tasks where write speed and having enough space both matter. Higher is better for that kind of workload.
- Efficiency (0–100) — How much speed you get for the capacity you are buying. Useful when you want a fast drive that still makes sense in a smaller laptop or a single crowded slot.
- Value score — Where this SSD lands compared with every drive we list, using a blend of the Play and Work scores. Think of it as our overall bang-for-your-buck ranking within our catalog — higher means it sits closer to the top of the pack.
- Rank label — A short word for how that value score feels day to day: Elite (90+), Strong (75+), Solid (60+), Budget (40+), Entry (under 40).
Sequential performance
Sequential read and write speeds as reported by the manufacturer. Real-world sustained throughput may vary.
Bar scaled relative to PCIe 5.0 top-end (~14 GB/s). PCIe 4.0 peaks around 7 GB/s; PCIe 3.0 around 3.5 GB/s.
Specifications
| Brand | WD |
|---|---|
| Model | SN850X |
| Capacity | 4 TB |
| Interface | NVMe PCIe 4.0 x4 |
| Form factor | M.2 2280 |
| PCIe generation | PCIe 4.0 |
| Sequential read | 7,300 MB/s |
| Sequential write | 6,600 MB/s |
| Tier | High-End |
Where to buy
Retailer links below search for WD SN850X 4 TB. Prices change daily — links open in a new tab.
United States
United Kingdom
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