SANDISK Optimus GX PRO 850X 4TB vs Z400s 256GB 2.5" SSD Comparison

The main differences between SANDISK Optimus GX PRO 850X 4TB and Sandisk Z400s 256GB 2.5" are in Capacity, Interface, NVME and Form Factor.

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SANDISK Optimus GX PRO 850X 4TB	Sandisk Z400s 256GB 2.5"
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 In 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-256G-1122
Release Date 📅 February 2026	Release Date 📅 June 2019
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (60 reviews) Add a product review
Performance (Charts) n/a	Performance (Charts) 359th / 1746
Effective Value -	Effective Value -
Price history View Details ►	Price history View Details ►
Price/GB $0.33	Price/GB -
GB/$1 3.01	GB/$1 -
Series -	Series Z400s
Capacity 4000 GB	Capacity 256 GB
Interface PCIe Gen4 x4	Interface SATA 6 Gb/s
NVME Yes	NVME No
Form Factor M.2-2280	Form Factor 2.5"
Max Sequential Read -	Max Sequential Read Up to 546 MB/s
Max Sequential Write -	Max Sequential Write Up to 342 MB/s
MTBF -	MTBF 1,750,000 hours