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, Form Factor and Max Sequential Read.

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SANDISK Optimus GX PRO 850X 4TB	WD_BLACK 4TB AN1500
Prices (Change region) In Stock $999.99 In Stock Free shipping $999.99 In Stock $999.99 Out of Stock Free shipping $999.99 Out of Stock Free shipping $1,517.00 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 $0.25	Price/GB $0.14
GB/$1 4	GB/$1 7.14
Series Optimus GX PRO 850X	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
NAND Flash Type 3D NAND TLC	NAND Flash Type -
Max Sequential Read Up to 7300 MB/s	Max Sequential Read Up to 6500 MB/s
Max Sequential Write Up to 6600 MB/s	Max Sequential Write Up to 4100 MB/s
MTBF 1,750,000 hours	MTBF 1.75M hours