SANDISK Optimus GX PRO 850X 4TB vs Optimus 5100 4TB SSD Comparison

SANDISK Optimus GX PRO 850X 4TB and SANDISK Optimus 5100 4TB are both solid state drives with the same Capacity (4000 GB), Interface (PCIe Gen4 x4) and Form Factor (M.2-2280). The main differences are in NAND Flash Type, Max Sequential Read and Max Sequential Write.

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SANDISK Optimus GX PRO 850X 4TB	SANDISK Optimus 5100 4TB
Prices (Change region) In Stock $1,329.99 In Stock Free shipping $1,329.99 In Stock $1,329.99 In Stock Free shipping $1,329.99 Out of Stock Free shipping $1,517.50 Show 2 more offers	Prices (Change region) In Stock Free shipping $1,373.50 In Stock + $11.20 Shipping $1,399.99
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Brand SanDisk	Brand SanDisk
Model SDSP81400TAN-000E0 SDSP81400TAN	Model SDSP51400TAN-000E0 SDSP51400TAN
Release Date 📅 February 2026	Release Date 📅 February 2026
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.33	Price/GB $0.34
GB/$1 3.01	GB/$1 2.91
Series Optimus GX PRO 850X	Series Optimus 5100
Capacity 4000 GB	Capacity 4000 GB
Interface PCIe Gen4 x4	Interface PCIe Gen4 x4
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor M.2-2280
NAND Flash Type 3D NAND TLC	NAND Flash Type QLC 3D CBA NAND
Cache -	Cache No DRAM (SLC)
Max Sequential Read Up to 7300 MB/s	Max Sequential Read Up to 6900 MB/s
Max Sequential Write Up to 6600 MB/s	Max Sequential Write Up to 6700 MB/s
MTBF 1,750,000 hours	MTBF 1,750,000 hours