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SANDISK 4TB Optimus™ GX PRO 850X PCIe® 4.0 x4 M.2 2280 NVMe™ SSD - SDSP81400TAN-000E0

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  • 850X 1TB
  • 850X 1TB w/ Heatsink
  • 850X 2TB
  • 850X 2TB w/ Heatsink
  • 850X 4TB
  • 850X 4TB w/ Heatsink
  • 850X 8TB w/ Heatsink
  • CHAMPION YOUR GAME SESSION AND CREATIVE WORKFLOW. Boasting PCIe® Gen 4.0 Sequential Read/Write speeds up to 7,300/6,600MB/s (2TB and 4TB models), your SSD enhances your game sessions and your creative workflow.
  • STAY IN THE GAME. Experience seamless game sessions and smooth multitasking with Random Read/Write speeds up to 1.2M/1.2M IOPS (8TB model) and integrated SANDISK® nCache™ 4.0 technology. Supports Microsoft® DirectStorage games.
  • NO NEED TO DELETE. Stop deleting to make room for more games or applications. With capacities up to 8TB and trusted SANDISK® BiCS TLC 3D NAND, you’ll have room for more.
  • DESIGNED WITH THE CREATOR IN MIND. With up to 4,800 TBW (8TB model) endurance rating, your drive stays by your side. Help protect your digital assets with TCG Opal v2.01 data-at-rest encryption.
  • YOU CAN DO MORE WITH SANDISK® SOFTWARE. Download the SANDISK® Dashboard application (Windows® only) to help keep your drive in peak shape. Or turn on Game Mode to transform your gaming experience.
  • REST EASY. Your hard work is covered with Sandisk’s 5-year limited warranty for peace of mind
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Overview
Specs
Reviews
SANDISK Optimus™ GX PRO 850X NVMe™ SSD
SANDISK Optimus™ GX PRO 850X NVMe™ SSD
Notes:

(1) 1MB/s = 1 million bytes per second. IOPS = input/output operations per second. Based on internal testing; performance may vary depending upon host device, usage conditions, drive capacity, and other factors.

(2) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.

(3) TBW (terabytes written) values calculated using JEDEC client workload (JESD219) and vary by product capacity.

(4) Check system BIOS for support or 3rd party software required to enable.

(5) Available for download; see the Sandisk website for more details.

SANDISK, the SANDISK logo, SANDISK Optimus, and nCache are registered marks or marks of Sandisk Corporation or its affiliates in the U.S. and/or other countries. Acronis and True Image are registered marks of Acronis International GmbH in the United States and other countries. The NVMe word mark is a mark of NVM Express, Inc. PCIe is a registered mark of PCI-SIG. Windows, Microsoft and DirectStorage are registered marks of the Microsoft group of companies. All other marks are the property of their respective owners. Product specifications subject to change without notice. Pictures shown may vary from actual products.

2026 Sandisk Corporation or its affiliates. All rights reserved.

Overview

The SANDISK Optimus™ GX PRO 850X is a 4TB internal solid state drive for desktop and notebook systems with an M.2 2280 slot and PCI-Express 4.0 x4 interface. It combines NVMe 1.4 performance, TLC 3D NAND, and high-capacity storage for gaming, applications, and creative workflows.


Key Features

  • 4TB capacity for storing games, applications, and creative files
  • PCIe® 4.0 x4 interface with NVMe 1.4 protocol
  • SanDisk BiCS TLC 3D NAND and SANDISK® nCache™ 4.0 technology
  • TCG Opal v2.01 data-at-rest encryption
  • SANDISK® Dashboard application for Windows® with Game Mode

Performance

Sequential performance reaches up to 7,300 MBps read and 6,600 MBps write. 4KB random performance reaches up to 1,200,000 IOPS read and 1,100,000 IOPS write. The drive is rated for up to 2,400TB written, with average active power of 8.0W for read and 7.2W for write, plus 5mW idle power.


Design

The drive uses an M.2 2280-D5-M form factor and is supplied without a heatsink. It measures 80mm deep, 22mm wide, and 3.88mm high, with a listed weight of 8.6g.


Connectivity & Compatibility

This internal SSD connects through a PCI-Express 4.0 x4 interface and uses the NVMe 1.4 protocol. Its M.2 2280-D5-M form factor is intended for systems with a compatible M.2 slot. The original listing also identifies support for Microsoft® DirectStorage games.


Reliability & Durability

The drive has a listed MTBF of 1,750,000 hours and an endurance rating of 2,400TB written. Operating temperature is 0°C to +85°C, while storage temperature is -40°C to +85°C. Shock resistance is rated at 1,500G at 0.5ms half-sine. Operating vibration is 5 gRMS at 10–2000Hz across 3 axes, and non-operating vibration is 4.9 gRMS at 7–800Hz across 3 axes. TCG Opal v2.01 data-at-rest encryption helps protect stored data.


Software & Tools

The SANDISK® Dashboard application is available for Windows® and provides drive management tools. The original listing also identifies Game Mode as an available software feature.


Specifications

  • Brand: SanDisk
  • Series: Optimus GX PRO 850X
  • Model: SDSP81400TAN-000E0
  • Device Type: Internal Solid State Drive (SSD)
  • Capacity: 4TB
  • Form Factor: M.2 2280-D5-M
  • Memory Components: 3D NAND TLC
  • Interface: PCI-Express 4.0 x4
  • Protocol: NVMe 1.4
  • Max Sequential Read: Up to 7300 MBps
  • Max Sequential Write: Up to 6600 MBps
  • 4KB Random Read: Up to 1,200,000 IOPS
  • 4KB Random Write: Up to 1,100,000 IOPS
  • Terabytes Written (TBW): 2400TB
  • MTBF: 1,750,000 hours
  • Heatsink: Without heatsink
  • Idle Power: 5mW
  • Average Active Power Read: 8.0W
  • Average Active Power Write: 7.2W
  • Operating Temperature: 0°C to +85°C
  • Storage Temperature: -40°C to +85°C
  • Height: 3.88mm
  • Width: 22mm
  • Depth: 80mm
  • Weight: 8.6g

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies*

  • Return for refund within: 30 days
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  • This item is covered by Newegg.com's International Order Return Policy.
  • Read full return policy for details.
  • *Subject to applicable law

  • Warranty Notice:

    This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.

Manufacturer Contact Info

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The SanDisk Optimus GX PRO 850X is a 4TB M.2 2280 PCIe 4.0 x4 NVMe SSD with sequential speeds up to 7,300 MB/s read and 6,600 MB/s write, suited to PC gamers and creators who want fast storage for games, applications, and active projects.

Recommended For

  • PC gamers expanding a modern PCIe 4.0 gaming library who want 4TB in one M.2 drive and faster game loading, rather than adding multiple smaller drives.
  • Video editors and digital-content creators working with large project files who want a high-capacity internal drive for active media and fast file access.
  • Builders of PCIe 4.0 gaming or creator desktops with an M.2 2280 slot and motherboard cooling who want a fast TLC SSD for a large games or project drive.
  • Users who regularly install or move large applications and media libraries and prefer a single 4TB internal drive over frequent storage cleanup.

Spec Summary

AttributeValue
Best For4TB internal storage for gaming, business, and personal use
Capacity4TB
Interface And Form FactorM.2 2280 internal SSD with PCIe 4.0 x4 and NVMe 1.4
Read Write PerformanceSequential read up to 7,300 MB/s and write up to 6,600 MB/s; 4KB random read up to 1,200,000 IOPS and write up to 1,100,000 IOPS
NAND And Reliability3D NAND TLC, rated for 2,400TB written and 1,750,000 hours MTBF
Power And Operating Conditions5mW idle power; average active power of 8.0W for reads and 7.2W for writes; operating temperature 0°C to 85°C and storage temperature -40°C to 85°C
Physical Specifications80 × 22 × 3.88mm; weighs 8.6g; no heatsink included; rated for 1,500G shock at 0.5ms and specified operating and non-operating vibration resistance
Device CompatibilityListed for desktop and laptop systems, and compatible with Sony PlayStation 5 and Microsoft Xbox Series S
Model IdentifiersSanDisk Optimus GX PRO 850X; model SDSP81400TAN-000E0