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Rectangular green circuit board with gold edge connector and black memory chips

SanDisk

SanDisk Optimus GX PRO 850X 4TB internal SSD SDSP81400TAN-000E0

SKU CH-B8FZ-V7K2N MPN SDSP81400TAN-000E0

PCIe 4.0 x4 NVMe 1.4 M.2 2280 4TB drive with 7300 MBps read, 6600 MBps write and 2400 TBW endurance

  • 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-D5-M
  • Product typeInternal Solid State Drive (SSD)

Capacity 4TB

  • Sequential reads up to 7300 MBps accelerate game loads
  • Sequential writes up to 6600 MBps speed creative exports
  • Random 4K reads up to 1,200,000 IOPS keep multitasking responsive
  • 2400 TBW endurance protects long-term project storage
  • PCIe 4.0 x4 NVMe 1.4 interface fits M.2 2280 slots

Capacity and audience

The SanDisk Optimus GX PRO 850X is a 4TB internal SSD built on 3D NAND TLC. It targets gamers and creators who need fast sequential throughput and high endurance for large libraries or project files.

PCIe 4.0 upgrade path

This drive uses a PCI-Express 4.0 x4 interface with NVMe 1.4 protocol, replacing SATA SSDs or earlier PCIe 3.0 NVMe units. The jump is worth it when your workload demands sustained reads up to 7300 MBps and writes up to 6600 MBps.

Compatibility checklist

Verify your motherboard has an M.2 2280-D5-M slot wired for PCIe 4.0 x4 and that the BIOS supports NVMe 1.4. The module has no heatsink, so confirm your board or chassis provides adequate airflow for the 0°C to 85°C operating range.

How it compares

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

Price $795.99
Pricier than about 87% 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 $199.00 per TB
Pricier than about 60% of the 1,362 comparable items (median $165.50 per TB).

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Specifications

Product
Brand nameSanDisk
Product lineOptimus GX PRO 850X
Model nameSDSP81400TAN-000E0
Total capacity4 TB
Product typeInternal Solid State Drive (SSD)
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 1.4
Ports & slots
Interface typePCI-Express 4.0 x4
Power
Idle power draw5 mW
Active power drawAverage Active Power Read: 8.0 W
Average Active Power Write: 7.2 W
Size & build
Form factorM.2 2280-D5-M
Heat sinkWithout HeatSink
Overall height3.88 mm
Overall width22 mm
Product depth80 mm
Product weight8.6g
Shipping weight0.05 kg
Package size127 × 102 × 1 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 between failures1,750,000 h

Other versions of this model

5 more in the same range

Questions about this item

Does the M.2 2280-D5-M form factor fit a standard 22 mm wide motherboard slot?

Yes, the drive is 22 mm wide and 80 mm long, matching the standard M.2 2280 slot found on most desktop and laptop motherboards.

Is a heatsink required when installing this drive without a built-in heatsink?

The drive ships without a heatsink; many motherboards include an M.2 shield that acts as a heatsink, so attach the thermal pad to that shield during installation.

What endurance rating should I expect for the 4 TB model over its lifespan?

The 4 TB version is rated for 2400 TBW, meaning you can write up to 2.4 petabytes before the warranty endurance limit is reached.

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