WD Black SN850X 2TB Review: 8.6/10 - Lightning-Fast Storage
We may earn a commission from links on this page Learn more
At no additional cost to you. As an Amazon Associate we earn from qualifying purchases; we also participate in the eBay Partner Network (EPN). See our full disclosure.
The WD Black SN850X 2TB scores 8.6/10 for its storage performance and reliability.
users who need fast, reliable, high-endurance storage for heavy workloads
your current drive has enough capacity and speed for your workload
Prices last checked June 2026
Overview
The WD Black SN850X 2TB is a high-performance 2TB SSD from WD with PCIe 4.0 x4 NVMe 1.4 interface. With sequential read speeds of 7300 MB/s and write speeds of 6300 MB/s, it delivers cutting-edge performance for demanding workloads like gaming, content creation, and data-intensive applications.
Design & Build
The WD Black SN850X 2TB is a M.2 2280 drive built to the highest quality standards with SanDisk BiCS5 3D TLC. Its compact form factor ensures compatibility with most modern laptops and desktops supporting PCIe 4.0 x4 NVMe 1.4 drives. The double-sided NAND layout carefully manages thermal characteristics under sustained loads.
Performance
The WD Black SN850X 2TB delivers outstanding performance with sequential read speeds of 7300 MB/s and write speeds of 6300 MB/s. Random IO performance is excellent, making it ideal for both everyday computing and demanding workloads like video editing, 3D rendering, and game loading. The PCIe 4.0 x4 NVMe 1.4 interface ensures full bandwidth for sustained transfers.
Features
Blazing Speeds: With sequential reads of 7300 MB/s and writes of 6300 MB/s, this SSD dramatically reduces load times and file transfer durations.
Reliability: Backed by a 5 years warranty, the drive is built with high-quality NAND flash and a robust controller for long-term dependability.
Pros
- Class-leading sequential reads at 7300 MB/s - among the fastest PCIe 4.0 drives available
- High endurance rating (1200 TBW) ensures long-term reliability for heavy workloads
Cons
- TLC NAND may have slower sustained write speeds compared to premium MLC/PLC drives
- DRAM-less budget variants can impact sustained write performance
Verdict
The WD Black SN850X 2TB scores 8.6/10 for its storage performance and reliability. Sequential speeds, endurance (TBW), and warranty length are the critical factors. Compare against WD Black, Crucial, and Seagate alternatives at similar capacities to find the best balance of speed, endurance, and price.
As an Amazon Associate I earn from qualifying purchases.
Sources
- WD Black SN850X 2TB Review - Tom’s Hardware - tomshardware.com
- WD Black SN850X 2TB on eBay
Where to Buy
Check current pricing on eBay or Amazon.
Prices last checked June 2026. Pricing and availability are accurate as of the date/time indicated and are subject to change.
📊 Comparison: WD Black SN850X 2TB vs. Competitors
| Specification | WD Black SN850X 2TB | Crucial T700 | Samsung 990 Pro SSD | WD Black SN850X |
|---|---|---|---|---|
| Price | $143 | $290 | $170 | $160 |
| Capacity | 2TB | 1TB, 2TB, 4TB | 1TB, 2TB, 4TB | 1TB, 2TB, 4TB, 8TB |
| Interface | PCIe 4.0 x4 NVMe 1.4 | PCIe Gen 5.0 x4, NVMe 2.0 | PCIe Gen 4.0 x4, NVMe 2.0 | PCIe Gen 4.0 x4, NVMe 1.4 |
| Read | 7300 MB/s | -- | -- | -- |
| Write | 6300 MB/s | -- | -- | -- |
| Form | M.2 2280 | -- | -- | -- |
| Warranty | 5 years | 5-year limited | 5-year limited | 5-year limited |
| Nand | SanDisk BiCS5 3D TLC | -- | -- | -- |
| Controller | WD proprietary | Phison E26 | Samsung Pascal in-house controller | WD Black G2 (20-82-20035-B2) |
| Form Factor | -- | M.2 2280 | M.2 2280 | M.2 2280 |
| NAND | -- | Micron 232-layer 3D TLC | Samsung 176-layer V-NAND 3-bit TLC | Kioxia 112-layer BiCS5 TLC |
| DRAM | -- | Yes, onboard DDR4 | 1GB LPDDR4 (1TB), 2GB LPDDR4 (2TB) | Yes, onboard DDR4 |
| Seq Read | -- | 12,400 MB/s | 7,450 MB/s | 7,300 MB/s |
| Seq Write | -- | 11,800 MB/s | 6,900 MB/s | 6,600 MB/s |
| Random Read | -- | 1,500K IOPS | 1,400K IOPS (2TB) | 1,200K IOPS |
| Random Write | -- | 1,500K IOPS | 1,550K IOPS | 1,100K IOPS |
| Endurance | -- | 600 TBW (1TB), 1,200 TBW (2TB), 2,400 TBW (4TB) | 600 TBW (1TB), 1,200 TBW (2TB) | 600 TBW (1TB), 1,200 TBW (2TB) |
How We Rate Products
Every product on ComfyTechCheck is scored on a 1 to 10 scale based on a structured evaluation framework. We assess products across five core criteria:
- Performance (30% weight): Speed, responsiveness, and real-world capability in its category.
- Build & Design (20% weight): Material quality, ergonomics, and aesthetic appeal.
- Features (20% weight): Breadth and usefulness of included functionality.
- Value (20% weight): Price-to-performance ratio relative to direct competitors.
- Battery Life or Reliability (10% weight): Endurance testing for portable devices, or long-term dependability for stationary gear.
Scores are assigned by our editorial team after hands-on testing or extensive research using verified user reports, expert analysis, and technical specifications. The weighted average produces the final rating you see on each review. This methodology is inspired by established consumer review standards from organizations such as Consumer Reports and Which?, adapted for the tech product categories we cover.
For a detailed breakdown of our full research and review process, visit our How We Rate page.