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Green rectangular M.2 2280 circuit board with black controller and silver NAND chips

SanDisk

SanDisk WDS400T2X0E 4TB internal SSD

SKU CH-13PD-HP9TV MPN WDS400T2X0E

4TB M.2 2280 NVMe SSD with 4GB DRAM cache delivers up to 7300 MB/s sequential read and 6600 MB/s write for gaming and heavy workloads

  • Total capacity4 TB
  • Sequential read speedUp to 7,300 MB/s
  • Sequential write speedUp to 6,600 MB/s
  • Interface typePCI-Express 4.0 x4
  • Form factorM.2 2280
  • Product typeInternal Solid State Drive (SSD)
  • 7,300 MBps sequential read accelerates game loading
  • 6,600 MBps sequential write speeds large file saves
  • 1,200,000 IOPS random read keeps gameplay responsive
  • 4GB DRAM cache sustains heavy workloads
  • 2,400 TBW endurance protects long-term data

WD_BLACK SN850X 4TB gaming SSD

The WD_BLACK SN850X 4TB drive uses a PCIe 4.0 x4 interface and NVMe protocol to deliver sequential reads up to 7300 MBps and writes up to 6600 MBps. Its 3D NAND TLC memory and 4GB DRAM cache target enthusiasts who want fast game loads and responsive system performance.

Sustained workload behaviour

Random read performance reaches 1200000 IOPS and random write reaches 1100000 IOPS, supporting heavy multitasking and large texture streaming without rapid throttling. The drive is rated for 2400 TBW and an MTTF of 1.75M hours, indicating endurance for long-term write-intensive use. Adaptive Thermal Management helps regulate temperature during extended sessions.

PCIe 4.0 x4 interface limits

The PCIe 4.0 x4 link caps theoretical throughput near 8GBps, so the 7300 MBps read ceiling sits close to the bus maximum. Systems limited to PCIe 3.0 will restrict sequential speeds to roughly half that figure. The M.2 2280 form factor fits standard motherboard slots, but the drive ships without a heatsink, so thermal headroom depends on platform airflow.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $170.99
Typical for this category: the median of 1,994 items is $180.49.
Total capacity 4 TB
Higher than about 90% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 7,300 MB/s
Higher than about 87% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $42.75 per TB
Cheaper than about 98% of the 1,362 comparable items (median $165.50 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameWestern Digital
Product lineBLACK SN850X NVMe
Model nameWDS400T2 × 0E
Total capacity4 TB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 7,300 MB/s
Sequential write speedUp to 6,600 MB/s
Random read (4K)Up to 1,200,000 IOPS
Random write (4K)Up to 1,100,000 IOPS
Storage
NAND flash type3D NAND TLC
Cache memory4 GB DRAM
Write endurance2400 TB
Connectivity
Connection protocolNVMe
Ports & slots
Interface typePCI-Express 4.0 x4
Size & build
Form factorM.2 2280
Heat sinkWithout HeatSink
Overall height2.38 mm
Overall width22 mm
Product depth80 mm
Product weight7.5g
Shipping weight0.05 kg
Package size130 × 102 × 95 mm
Environment & compliance
Operating temperature range0 °C to 85 °C
Storage temperature range-40 °C to 85 °C
Max shock tolerance1,500G @0.5 ms half sine
Vibration toleranceOperating Vibration: 5 gRMS, 10-2000 Hz, 3 axes
Non-operating Vibration: 4.9 gRMS, 7-800 Hz, 3 axes
More details
Mean time to failure1.75M Hours

Questions about this item

Does this M.2 2280 drive need a motherboard slot that supports PCIe 4.0 x4 to reach the 7300 MBps read speed?

Yes, a PCIe 4.0 x4 M.2 slot is required for the full 7300 MBps sequential read and 6600 MBps write; on a PCIe 3.0 slot speeds will be lower.

The drive ships without a heatsink — will I need to add one for sustained gaming loads?

The drive includes Adaptive Thermal Management and operates up to 85 °C; a motherboard M.2 heatsink or the optional WD_BLACK heatsink model helps maintain peak throughput during long sessions.

Is the 4GB DRAM cache and 2400 TBW rating sufficient for a primary game and OS drive?

The 4GB DRAM cache accelerates random performance to 1200000 read IOPS and 1100000 write IOPS, while 2400 TBW and 1.75M hour MTTF give ample endurance for heavy daily use.

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