SANDISK OPTIMUS GX PRO 850X 4TB M.2 (2280) PCIe Gen 4 NVMe 1.4 SSD / Solid State Drive

SANDISK Optimus GX PRO 850X 4TB SSD

The SANDISK Optimus GX PRO 850X 4TB SSD is a high-performance internal storage solution designed to deliver rapid data transfer and enduring reliability for gaming, professional content creation and high-demand computing. Built around the PCIe 4.0 ×4 NVMe 1.4 interface, this M.2 2280 SSD combines TLC 3D NAND and nCache 4.0 technology to provide fast sequential and random performance that keeps pace with modern workloads. With a large 4TB capacity, the drive provides ample room for large game libraries, high-resolution video projects and extensive data collections without the need for external storage. Featuring up to 1.2M IOPS random performance, support for Microsoft DirectStorage, and a robust 2,400 TBW endurance rating, this Optimus GX PRO 850X is engineered for sustained high throughput, smooth multitasking and long-term reliability. A 5-year limited warranty and support for SanDisk Dashboard software further reinforce its appeal for performance-oriented systems and creative workstations.

High-Speed PCIe 4.0 Performance

The Optimus GX PRO 850X SSD utilises a PCIe 4.0 ×4 NVMe 1.4 controller and cache architecture to deliver high sequential read speeds of up to 7,300 MB/s and write speeds of up to 6,600 MB/s; perfect for large file transfers, game load performance and media editing. Its rapid random read and write performance supports responsive system behaviour under data-intensive workloads, such as complex project files, large multi-application tasking and real-time game asset streaming.

Massive Capacity and Storage Versatility

With a full 4TB storage capacity, the SX850X SSD enables users to store and access extensive content libraries without frequent file management or reliance on multiple drives. Whether housing thousands of games, multi-gigabyte video projects, virtual machine images or large datasets, the substantial capacity paired with high NVMe throughput helps maintain system responsiveness and reduces reliance on slower external media.

Reliability, Endurance and Security

Engineered with enterprise-grade SanDisk TLC 3D NAND and advanced cache technology, this SSD is rated for up to 2,400 TBW, reflecting its ability to handle heavy write workloads over extended use. The drive supports TCG Opal 2.01 data-at-rest encryption for enhanced data security and integrates with SanDisk Dashboard software for drive health monitoring, performance tuning and features such as Game Mode and migration tools. These capabilities help protect data integrity and provide long-term usability for demanding gaming and creative environments.

Platform Support and Compatibility

The Optimus GX PRO 850X SSD is compatible with PCIe 4.0 systems and also backwards compatible with PCIe 3.0 hosts, ensuring wide hardware integration across desktops and high-performance laptops with M.2 2280 slots. It supports Microsoft DirectStorage, which helps streamline game asset loading and reduces storage bottlenecks in supported titles. Combined with its high capacity and sustained performance, this makes the drive a versatile choice for future-ready platforms in both gaming and professional settings.

• 4TB PCIe 4.0 ×4 NVMe 1.4 internal SSD capacity.
• M.2 2280 form factor for modern system integration.
• Sequential read up to 7,300 MB/s and 6,600 MB/s write.
• Up to 1.2M IOPS for random read/write performance.
• SANDISK nCache 4.0 technology.
• SanDisk TLC 3D NAND.
• Up to 2,400 TBW endurance rating.
• TCG Opal 2.01 data-at-rest encryption support.
• Support for Microsoft DirectStorage.
• 5-year limited warranty.