SANDISK Optimus GX PRO 850X 4TB vs WD_BLACK 4TB AN1500 SSD Comparison

The main differences between SANDISK Optimus GX PRO 850X 4TB and WD_BLACK 4TB AN1500 are in Capacity, Interface and Form Factor.

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SANDISK Optimus GX PRO 850X 4TB	WD_BLACK 4TB AN1500
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 $139.99 Out of Stock Free shipping $172.99 Out of Stock Free shipping $249.99 Out of Stock Free shipping $910.99 - Buy now Show 2 more offers
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Brand SanDisk	Brand Western Digital
Model SDSP81400TAN-000E0 SDSP81400TAN	Model WDS100T1X0L-00AUJ0 WDS100T1X0L
Release Date 📅 February 2026	Release Date 📅 October 2020
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (15 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.33	Price/GB $0.14
GB/$1 3.01	GB/$1 7.14
Series -	Series BLACK AN1500 NVMe
Capacity 4000 GB	Capacity 1000 GB
Interface PCIe Gen4 x4	Interface PCIe Gen3 x8
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor PCIe
Max Sequential Read -	Max Sequential Read Up to 6500 MB/s
Max Sequential Write -	Max Sequential Write Up to 4100 MB/s
MTBF -	MTBF 1.75M hours
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