WD Black SN850X Review: 9.0/10 - Elite gaming NVMe SSD with Game Mode 2.0
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At a Glance
The WD Black SN850X is an exceptional gaming SSD that delivers top-tier PCIe 4.0 performance with thoughtful gaming-centric features.
Prices last checked June 2026
Overview
The WD Black SN850X is Western Digital’s premier gaming-focused NVMe SSD, delivering sequential read speeds up to 7,300 MB/s and write speeds up to 6,600 MB/s. Launched in May 2022, it builds on the SN850 with higher capacities up to 8TB and exclusive Game Mode 2.0 features. The drive uses Kioxia 112-layer BiCS5 TLC NAND paired with WD’s custom Black G2 controller for exceptional gaming and content creation performance. It competes directly with the Samsung 990 Pro (7,450 MB/s reads) and the Seagate FireCuda 530 (7,300 MB/s), but sets itself apart with Game Mode 2.0’s Predictive Loading and the unique 8TB capacity option that no rival currently offers.
Design & Build
The SN850X adopts the standard M.2 2280 form factor with a single-sided design for most capacities, though the 4TB variant uses a double-sided PCB. A version with an integrated heatsink is available featuring RGB lighting controlled via WD’s Dashboard software. The drive includes WD’s Adaptive Thermal Management to prevent throttling during sustained workloads. Build quality is robust, and the black PCB with clean component layout reflects the product’s premium positioning.
Performance
In benchmarks, the SN850X achieves 7,300 MB/s sequential reads and 6,600 MB/s sequential writes, placing it among the fastest PCIe 4.0 drives. Random performance reaches 1.2 million IOPS read and 1.1 million IOPS write. Game Mode 2.0 includes Predictive Loading that pre-loads game assets for up to 15% faster level transitions in supported titles. Large file transfers of 100GB maintain speeds above 3,000 MB/s throughout thanks to a 600GB SLC cache on the 2TB model.
Features
The WD Black Dashboard software is the control center, offering drive health monitoring, firmware updates, and RGB customization on heatsink models. Game Mode 2.0 adds Predictive Loading to anticipate data needs, Overhead Balancing to manage multi-queue operations, and Automatic Thermal Management to maintain peak performance. The drive supports Microsoft DirectStorage for reduced CPU utilization and faster load times in compatible games.
Pros
- Excellent sequential (7,300 MB/s) and random 4K (1.2M IOPS read) performance, among the fastest PCIe 4.0 drives
- Game Mode 2.0 with Predictive Loading technology for up to 15% faster level transitions
- Available in capacities up to 8TB - unique in the consumer PCIe 4.0 market
- Optional RGB heatsink version for showcase gaming builds
- Strong 5-year warranty with 600 TBW per TB endurance rating
- 600 GB SLC cache on 2TB model maintains >3,000 MB/s writes during sustained transfers
Cons
- PCIe 4.0 only, no Gen 5 support on this model; next-gen SN8100 already offers Gen 5 speeds
- Heatsink version is thicker (single-sided) and may not fit all laptops or PS5 clearance
- Dashboard software is Windows-only - no macOS or Linux utility for drive management
- Premium price per gigabyte versus competitors (Samsung 990 Pro is often $10-20 less for equivalent capacity)
Verdict
The WD Black SN850X is an exceptional gaming SSD that delivers top-tier PCIe 4.0 performance with thoughtful gaming-centric features. Its high capacity options and Game Mode 2.0 make it the go-to choice for serious gamers building high-end rigs.
Sources
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 vs. Competitors
| Specification | WD Black SN850X | Crucial T700 | Samsung 990 Pro SSD | Samsung T7 Shield |
|---|---|---|---|---|
| Price | $160 | $290 | $170 | $160 |
| Capacity | 1TB, 2TB, 4TB, 8TB | 1TB, 2TB, 4TB | 1TB, 2TB, 4TB | 1TB, 2TB, 4TB |
| Interface | PCIe Gen 4.0 x4, NVMe 1.4 | PCIe Gen 5.0 x4, NVMe 2.0 | PCIe Gen 4.0 x4, NVMe 2.0 | USB 3.2 Gen 2 (10 Gbps), USB-C |
| Form Factor | M.2 2280 | M.2 2280 | M.2 2280 | -- |
| Controller | WD Black G2 (20-82-20035-B2) | Phison E26 | Samsung Pascal in-house controller | -- |
| NAND | Kioxia 112-layer BiCS5 TLC | Micron 232-layer 3D TLC | Samsung 176-layer V-NAND 3-bit TLC | -- |
| DRAM | Yes, onboard DDR4 | Yes, onboard DDR4 | 1GB LPDDR4 (1TB), 2GB LPDDR4 (2TB) | -- |
| Seq Read | 7,300 MB/s | 12,400 MB/s | 7,450 MB/s | 1,050 MB/s |
| Seq Write | 6,600 MB/s | 11,800 MB/s | 6,900 MB/s | 1,000 MB/s |
| Random Read | 1,200K IOPS | 1,500K IOPS | 1,400K IOPS (2TB) | -- |
| Random Write | 1,100K IOPS | 1,500K IOPS | 1,550K IOPS | -- |
| Endurance | 600 TBW (1TB), 1,200 TBW (2TB) | 600 TBW (1TB), 1,200 TBW (2TB), 2,400 TBW (4TB) | 600 TBW (1TB), 1,200 TBW (2TB) | -- |
| Warranty | 5-year limited | 5-year limited | 5-year limited | 3-year limited |
| Durability | -- | -- | -- | IP65 rating, 3-meter drop resistant |
| Encryption | -- | -- | -- | AES 256-bit hardware encryption |
| Dimensions | -- | -- | -- | 88 x 59 x 13 mm |
| Weight | -- | -- | -- | 98 grams |
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.
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