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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

  • Device TypeInternal Solid State Drive (SSD)
  • Used ForConsumer
  • Form FactorM.2 2280
  • Capacity4TB
  • Memory Components3D NAND TLC
  • InterfacePCI-Express 4.0 x4

Options 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.

Highlights

  • 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

Specifications

BrandWestern Digital
SeriesBLACK SN850X NVMe
ModelWDS400T2X0E
Device TypeInternal Solid State Drive (SSD)
Used ForConsumer
Form FactorM.2 2280
Capacity4TB
Memory Components3D NAND TLC
InterfacePCI-Express 4.0 x4
ProtocolNVMe
Max Sequential ReadUp to 7300 MBps
Max Sequential WriteUp to 6600 MBps
4KB Random ReadUp to 1,200,000 IOPS
4KB Random WriteUp to 1,100,000 IOPS
Terabytes Written (TBW)2400TB
MTTF1.75M Hours
HeatSinkwithout HeatSink
FeaturesGet the Ultimate Gaming Edge
Insane speeds up to 7,300 MB/s deliver top-tier performance with ridiculously short load times for the elite gaming experience you've been waiting for.
Soup Up Your Rig
Extremely low latency loads graphics fast with minimal stutter and lagging for an incredibly smooth, satisfying gaming experience.
More Room for More Games
Today's A-list titles can take up 200GB or more of storage. A range of capacities from 1TB to 4TB means you get to keep more games at the ready and get into the action fast.
Heatsink for the Win
The WD_BLACK SN850X NVMe SSD 1TB and 2TB
Operating Temperature0°C ~ +85°C
Storage Temperature-40°C ~ +85°C
Max Shock Resistance1,500G @0.5 ms half sine
Max Vibration ResistanceOperating Vibration: 5 gRMS, 10-2000 Hz, 3 axes
Non-operating Vibration: 4.9 gRMS, 7-800 Hz, 3 axes
Height2.38mm
Width22.00mm
Depth80.00mm
Weight7.50g
Shipping weight0.05 kg
Package size130 × 102 × 95 mm

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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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