SANDISK Optimus GX PRO 850X 4TB vs Western Digital WD_BLACK SN7100 1TB SSD Comparison

SANDISK Optimus GX PRO 850X 4TB and Western Digital WD_BLACK SN7100 1TB are both solid state drives with the same Interface (PCIe Gen4 x4) and Form Factor (M.2-2280). The main differences are in Capacity.

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SANDISK Optimus GX PRO 850X 4TB	Western Digital WD_BLACK SN7100 1TB
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) In Stock Free shipping $174.98 In Stock $189.99 Last updated 39 minutes ago. In Stock $189.99 Out of Stock $189.99 In Stock Free shipping $209.99 Show 2 more offers
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Brand SanDisk	Brand Western Digital
Model SDSP81400TAN-000E0 SDSP81400TAN	Model WDS100T4X0E-00CJA0 WDS100T4X0E
Release Date 📅 February 2026	Release Date 📅 December 2024
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★★ (2 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.33	Price/GB $0.07
GB/$1 3.01	GB/$1 13.34
Series -	Series SN7100
Capacity 4000 GB	Capacity 1000 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 -	NAND Flash Type TLC 3D NAND
Max Sequential Read -	Max Sequential Read Up to 7250 MB/s
Max Sequential Write -	Max Sequential Write Up to 6900 MB/s
MTBF -	MTBF 1,750,000 hours