New
Western Digital Black SN850X
Capacity 4TB
Form Factor M.2 2280
Interface PCIe 4.0 x4
Read Speed 7,300 MB/s
NAND TLC
DRAM Cache Yes
Endurance 2400 TBW
94 Overall Score
Price $656
Snapshot
Pros & Cons
Pros
- Strong social proof (97th percentile) 97th
- Strong random (95th percentile) 95th
- Strong capacity (93rd percentile) 93rd
- Strong feature (89th percentile) 89th
Cons
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
Owner sentiment has held steady over time
Based on 17 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
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) | 6600 |
| Random Read (IOPS) | 1200000 |
| Random Write (IOPS) | 1100000 |
Hardware
| NAND | TLC |
| DRAM Cache | Yes |
| Controller | WD 20-82-20035-B1 |
Reliability
| Endurance (TBW) | 2400 |
| MTBF (hours) | 1750000 |
| Warranty (years) | 5 |
Features
| Heatsink | No |
| Hardware Encryption | No |
vs Competition
| Spec | Western Digital Black SN850X | Samsung 9100 PRO | Crucial T500 | Kingston FURY Renegade SFYRDK/2000G | SanDisk WD_BLACK SN850X | Corsair MP700 Elite |
|---|---|---|---|---|---|---|
| Capacity | 4TB | 8TB | 2TB | 2TB | 4TB | 2TB |
| Form Factor | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 |
| Interface | PCIe 4.0 x4 | PCIe 5.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 5.0 x4 |
| Seq Read | 7,300 MB/s | 14,800 MB/s | 7,400 MB/s | 7,300 MB/s | 7,300 MB/s | 10,000 MB/s |
| Nand Type | TLC | TLC | TLC | TLC | TLC | TLC |
| Dram Cache | true | true | true | true | true | true |
| Endurance | 2400 TBW | 4800 TBW | 1200 TBW | 2000 TBW | 4800 TBW | 1200 TBW |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Random | Feature | Capacity | Endurance | Social Proof |
|---|---|---|---|---|---|---|
| Western Digital Black SN850X | 87.8 | 94.6 | 88.6 | 92.9 | 88 | 96.6 |
| Samsung 9100 PRO Compare | 98.8 | 99.7 | 99.7 | 98.2 | 86 | 96.6 |
| Crucial T500 Compare | 93.5 | 96.2 | 98.9 | 78.5 | 83 | 99.7 |
| Kingston FURY Renegade SFYRDK/2000G Compare | 92.5 | 93.2 | 93.6 | 78.5 | 92.8 | 96.6 |
| SanDisk WD_BLACK SN850X Compare | 87.8 | 94.6 | 93.6 | 92.9 | 95.2 | 96.6 |
| Corsair MP700 Elite Compare | 94.6 | 96.3 | 99.7 | 78.5 | 87.4 | 48.9 |
Price
Value & Pricing
From $656
Newegg 2 offers From $656
Amazon 2 offers From $782
We started tracking prices for this product on Nov 8, 2026. The chart appears once we have more data.
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
