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

SanDisk

SanDisk WDS400T2X0E-00BCA0 4TB M.2 2280 NVMe internal SSD

SKU CH-DXK5-NT6BD MPN WDS400T2X0E-00BCA0

A 4 TB PCIe 4.0 x4 NVMe drive delivering up to 7,300 MB/s reads and 6,600 MB/s writes for fast game loading

  • 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)

Model 4TB SN850X w/o Heatsink

  • Sequential reads up to 7300 MBps cut game load times
  • Sequential writes up to 6600 MBps speed large file transfers
  • Random read 1200000 IOPS keeps open-world textures streaming
  • 2400 TBW endurance rating supports heavy daily writes
  • 75M hour MTTF indicates long-term drive reliability

4TB NVMe SSD for gaming PCs

This 4TB M.2 2280 drive uses PCI-Express 4.0 x4 and NVMe to deliver sequential reads up to 7300 MBps and writes up to 6600 MBps. Random performance reaches 1200000 read IOPS and 1100000 write IOPS. It is built with 3D NAND TLC and rated for 2400 TBW with a 1.75M hour MTTF. The model ships without a heatsink and targets consumers who want fast load times and capacity for large game libraries.

Check motherboard slot and cooling

Verify the board has an M.2 2280 slot wired for PCI-Express 4.0 x4 to reach the stated speeds. Ensure the BIOS is current and NVMe boot is enabled if the drive will hold the OS. Because this unit has no heatsink, confirm the motherboard provides a thermal pad or shield, or plan to add one, so the controller stays within the 0 to 85 °C operating range under sustained writes.

Thermals and power in normal use

Adaptive Thermal Management throttles the controller when temperatures approach the 85 °C limit, protecting data without fan noise from the drive itself. Idle power is low, and typical gaming workloads keep the SSD well below its thermal ceiling when the motherboard heatsink is present. The 2400 TBW rating and 1.75M hour MTTF reflect endurance for heavy daily write cycles.

How it compares

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

Price $520.99
Pricier than about 81% of the 1,994 comparable items (median $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 $130.25 per TB
Cheaper than about 67% 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
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

Other versions of this model

5 more in the same range

Questions about this item

Does the WDS400T2X0E-00BCA0 ship with a heatsink or mounting screw, or do I need to buy them separately?

This model is the without heatsink version. The drive itself is an M.2 2280 module; a heatsink and the motherboard mounting screw are not included and must be sourced separately if your board requires them.

How do I decide between the 4 TB model and the larger 8 TB model in the same series?

Both use the same PCI-Express 4.0 x4 interface and 3D NAND TLC. The 4 TB unit delivers 7300 MBps read, 6600 MBps write, 1200000 IOPS random read, 1100000 IOPS random write and 2400 TBW. The 8 TB model offers double the capacity with the same speed ratings and a higher TBW figure.

What does the 7300 MBps sequential read figure mean once the drive is installed in my PC?

It is the maximum throughput the controller can sustain over PCI-Express 4.0 x4 for large, contiguous files. Real-world game loads and OS boots will be lower, but the headroom keeps latency minimal even when the drive is nearly full.

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