SANDISK Optimus GX PRO 850X 4TB vs Western Digital SN720 512GB SSD Comparison

SANDISK Optimus GX PRO 850X 4TB and Western Digital SN720 512GB are both solid state drives with the same Form Factor (M.2-2280). The main differences are in Capacity and Interface.

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SANDISK Optimus GX PRO 850X 4TB	Western Digital SN720 512GB
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) Out of Stock Free shipping $162.99
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Brand SanDisk	Brand Western Digital
Model SDSP81400TAN-000E0 SDSP81400TAN	Model SDAQNTW-512G-1022
Release Date 📅 February 2026	Release Date 📅 November 2020
* 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 $0.32
GB/$1 3.01	GB/$1 3.14
Series -	Series PC SN720
Capacity 4000 GB	Capacity 512 GB
Interface PCIe Gen4 x4	Interface PCIe Gen3 x4
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor M.2-2280
SSD Controller -	SSD Controller SanDisk
Max Sequential Read -	Max Sequential Read Up to 3300 MB/s
Max Sequential Write -	Max Sequential Write Up to 2300 MB/s