New
Western Digital SSD PCIe 4.0 x4 NVMe
The 4TB SN850X hits 7300 MB/s sequential reads and writes, with a 2400 TBW endurance rating and a 5-year warranty. Its M.2 2280 form factor and optional heatsink make it a straightforward drop-in for desktops and PS5 builds. Best for gamers and workstation users who need high-capacity, sustained PCIe 4.0 performance.
Capacity 4TB
Form Factor M.2 2280
Interface PCIe 4.0 x4
Read Speed 7,300 MB/s
Endurance 2400 TBW
75 Overall Score
No current retailer price
Snapshot
Pros & Cons
Pros
- Strong capacity (93rd percentile) 93rd
- Strong speed (89th percentile) 89th
- Strong endurance (83rd percentile) 83rd
Cons
- Below average affordability (9th percentile)
- Below average feature (33rd percentile)
The proof
Performance
Specifications
Full Specifications
Drive
| Capacity | 4000 |
| Form Factor | M.2 2280 |
| Interface | PCIe 4.0 x4 |
| Protocol | NVMe |
| PCIe Generation | 4 |
| External | No |
Performance
| Sequential Read (MB/s) | 7300 |
| Sequential Write (MB/s) | 7300 |
Reliability
| Endurance (TBW) | 2400 |
| Warranty (years) | 5 |
Features
| Heatsink | Yes |
vs Competition
| Spec | Western Digital SSD | SanDisk Black SN850X WDBB9G0040BNC-WRSN | Kingston FURY Renegade G5 SFYR2S/4T0 | Samsung 990 PRO | Micron T710 CT4000T710SSD5 | Crucial T700 CT2000T700SSD5 |
|---|---|---|---|---|---|---|
| Capacity | 4TB | 4TB | 4TB | 2TB | 4TB | 2TB |
| Form Factor | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 |
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 5.0 x4 | PCIe 4.0 x4 | PCIe 5.0 | PCIe 5.0 |
| Seq Read | 7,300 MB/s | 7,300 MB/s | 14,800 MB/s | 7,450 MB/s | 14,500 MB/s | 12,400 MB/s |
| Nand Type | - | TLC | TLC | TLC | TLC | TLC |
| Dram Cache | - | true | true | true | false | true |
| Endurance | 2400 TBW | 2400 TBW | 4000 TBW | 1200 TBW | 2400 TBW | 1200 TBW |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Random | Feature | Capacity | Endurance | Social Proof | Affordability |
|---|---|---|---|---|---|---|---|
| Western Digital SSD | 89 | 61.7 | 33.4 | 92.6 | 83 | 48.6 | 8.5 |
| SanDisk Black SN850X WDBB9G0040BNC-WRSN Compare | 89 | 95.6 | 89.4 | 92.6 | 88.1 | 95.3 | 10.4 |
| Kingston FURY Renegade G5 SFYR2S/4T0 Compare | 99.5 | 99 | 90.9 | 92.6 | 93.6 | 87.1 | 6.3 |
| Samsung 990 PRO Compare | 93.7 | 97.4 | 98.9 | 78.5 | 86 | 95.3 | 23.4 |
| Micron T710 CT4000T710SSD5 Compare | 99.1 | 99.2 | 89.4 | 92.6 | 86 | 77.4 | 11.2 |
| Crucial T700 CT2000T700SSD5 Compare | 96.6 | 97.6 | 97.5 | 78.5 | 83 | 77.4 | 23.8 |
Price
Value & Pricing
We started tracking prices for this product on Nov 12, 2026. The chart appears once we have more data.
Usage Scores
- Overall75.2
- Budget64.6
- Gaming74
- Laptop63.9
- Console75
- Portable19.7
- Workstation74.5
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
