WD Black SN850X 2TB Review: 8.6/10 - Lightning-Fast Storage
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The WD Black SN850X 2TB scores 8.6/10 for its storage performance and reliability.
users seeking high-speed data transfers and reliable storage from the WD Black SN850X 2TB
your current storage drives have plenty of free space and read/write speed comparable to the WD Black SN850X 2TB
Prices last checked July 25, 2026
Overview
The WD Black SN850X 2TB is a high-performance 2TB SSD from WD with a PCIe 4.0 x4 NVMe 1.4 interface, launched in May 2022 as the successor to the original SN850. 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. Priced at $143, the SN850X 2TB stands as the value pick among flagship PCIe 4.0 drives, undercutting the Samsung 990 Pro 2TB ($169), Seagate FireCuda 530 2TB ($189), and Kingston KC3000 2TB ($159) while matching or beating their sequential throughput. Key competitors include the Samsung 990 Pro 2TB and Crucial T700 2TB, both of which trade blows on sustained-write benchmarks, though the T700 is a PCIe 5.0 drive at a different price tier.
Design & Build
The WD Black SN850X 2TB is an M.2 2280 drive (80 x 22 x 2.38 mm, roughly 7.5g) built around SanDisk BiCS5 112-layer 3D TLC NAND paired with a WD proprietary in-house controller (Black G2, part 20-82-20035-B2), which historically pairs a multi-core ARM Cortex-R series CPU with a PCIe 4.0 x4 host interface. Its compact single-sided form factor ensures broad compatibility with modern laptops, desktops, and the PlayStation 5 storage expansion slot. The bare drive PCB is a deep black with WD Black branding; the optional WDS200T2XHE heatsink variant (sold separately) adds a 3.5mm-thick graphene-copper cooler for users running sustained writes or operating inside thermally constrained chassis.
Performance
The WD Black SN850X 2TB delivers outstanding performance with sequential read speeds of 7300 MB/s and write speeds of 6300 MB/s, putting it at the very top of the PCIe 4.0 x4 generation. Random IO performance is excellent (up to 1,200,000 IOPS read / 1,100,000 IOPS write at QD32/T32), making it ideal for both everyday computing and demanding workloads like video editing, 3D rendering, DirectStorage-enabled game loading, and large file transfers. WD’s Game Mode 2.0 firmware feature further reduces in-game texture load latency by pre-fetching assets based on access patterns, a tangible benefit measured in Tom’s Hardware testing. The drive’s nCache 4.0 dynamic SLC cache absorbs bursts of write data well, and once the cache is exhausted, direct-to-TLC sustained writes settle around 2,000 MB/s on the 2TB model - faster than the smaller 500GB/1TB SKUs. The 2TB variant uses a 2GB DDR4 DRAM cache, twice the 1GB on the 1TB SKU, which is why random-write IOPS hold up better than the smaller capacities.
Features
The WD Black SN850X 2TB pairs the WD Black G2 in-house controller (part number 20-82-20035-B2) with SanDisk BiCS5 112-layer 3D TLC NAND and 2GB of DDR4 DRAM cache on the 2TB variant. WD’s Game Mode 2.0 firmware feature uses predictive asset loading to cut in-game texture pop-in, with a measurable benefit when paired with Microsoft DirectStorage on Windows 11. The drive ships in the M.2 2280 single-sided form factor, drawing roughly 5.9W under load and 2.5W at idle. WD’s Black Dashboard utility provides drive health, temperature, and firmware update management, and the drive is rated for 1200 TBW endurance over its 5-year warranty. The bare drive ships without a heatsink; an optional WDS200T2XHE variant with a pre-applied graphene-copper heatsink is sold separately for sustained-workload use in thermally constrained builds like the PlayStation 5 storage expansion slot.
Pros
- Class-leading sequential reads at 7300 MB/s and writes at 6300 MB/s - among the fastest PCIe 4.0 drives available
- Strong 1200 TBW endurance rating backed by a 5-year warranty for heavy write workloads
- Game Mode 2.0 firmware reduces texture pop-in and improves DirectStorage asset loading on Windows 11
- Excellent value at $143 - cheaper than the Samsung 990 Pro 2TB ($169) and Seagate FireCuda 530 2TB ($189)
- M.2 2280 single-sided form factor fits PS5 storage expansion slot and most thin-and-light laptops
- Backed by a 5-year WD warranty and the WD Black Dashboard for monitoring drive health, temperature, and firmware updates
Cons
- Slower sustained writes than PCIe 5.0 alternatives like the Crucial T700 2TB once the SLC cache is exhausted
- No integrated heatsink on the bare drive; high sustained workloads require the optional WDS200T2XHE heatsink model
- DRAM-less 500GB and 1TB SKUs (with HMB only) trade off some random-write performance vs the fully-equipped 2TB/4TB variants
Verdict
The WD Black SN850X 2TB scores 8.6/10 for its storage performance and reliability at a $143 price point. Sequential throughput, 1200 TBW endurance, and a 5-year warranty make it the value pick among flagship PCIe 4.0 drives, edging past the Samsung 990 Pro 2TB on price while matching it on raw read speed. Compare against the Samsung 990 Pro 2TB, Crucial T700 2TB, and Seagate FireCuda 530 2TB at similar capacities to find the best balance of speed, endurance, and price.
Disclosure: As an Amazon Associate I earn from qualifying purchases. We also participate in the eBay Partner Network (EPN) affiliate program.
Sources
- WD_BLACK SN850X NVMe SSD Product Page - westerndigital.com
- WD Black SN850X SSD Review: Back in Black - Tom’s Hardware - tomshardware.com
- WD Black SN850X Review - PCMag - pcmag.com
- Western Digital SN850X 2 TB Specs - TechPowerUp - techpowerup.com
- 2TB WD Black SN850X Deal Coverage - Tom’s Hardware - tomshardware.com
- WD Black SN850X 2TB on Amazon - amazon.com
- WD Black SN850X 2TB on eBay - ebay.com
Technical Specifications
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 |
| Best Value | 8.6/143 | 9.4/290 | 9.2/170 | 9.0/160 |
| 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) |
| Verify Price | Verify Price | Verify Price | Verify Price |
How We Scored This Product
Every product on ComfyTechCheck is scored on a 1 to 10 scale across four criteria. Each criterion is weighted differently depending on the product category to reflect what matters most to real buyers.
- Performance & Capabilities 40% Speed, accuracy, quality of output in its category.
- Build & Design Quality 30% Materials, construction quality, durability, form factor.
- Consumer Value 20% Price-to-performance ratio relative to direct competitors.
- User Experience 10% Ease of setup, daily usability, comfort, ergonomics.
Scores are assigned by our editorial team after hands-on testing or extensive research using verified user reports, expert analysis, and technical specifications. For the full weight breakdown by category, visit our How We Rate page.