SANDISK Optimus GX PRO 850X 4TB vs Z400s 64GB SSD Comparison

SANDISK Optimus GX PRO 850X 4TB and Sandisk Z400s 64GB are both solid state drives with the same MTBF (1,750,000 hours). The main differences are in Capacity, Interface, NVME and Form Factor.

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SANDISK Optimus GX PRO 850X 4TB	Sandisk Z400s 64GB
Prices (Change region) In Stock $999.99 In Stock $1,329.99 In Stock Free shipping $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) - Buy now
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Brand SanDisk	Brand SanDisk
Model SDSP81400TAN-000E0 SDSP81400TAN	Model SD8SBAT-064G-1122
Release Date 📅 February 2026	Release Date 📅 November 2015
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★☆☆ (3 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.25	Price/GB -
GB/$1 4	GB/$1 -
Series Optimus GX PRO 850X	Series Z400s
Capacity 4000 GB	Capacity 64 GB
Interface PCIe Gen4 x4	Interface SATA 6 Gb/s
NVME Yes	NVME No
Form Factor M.2-2280	Form Factor 2.5"
NAND Flash Type 3D NAND TLC	NAND Flash Type MLC
Max Sequential Read Up to 7300 MB/s	Max Sequential Read Up to 546 MB/s
Max Sequential Write Up to 6600 MB/s	Max Sequential Write Up to 94 MB/s
MTBF 1,750,000 hours	MTBF 1,750,000 hours