SANDISK Optimus GX PRO 850X 4TB vs Western Digital WD Blue SN5000 4TB SSD Comparison

SANDISK Optimus GX PRO 850X 4TB and Western Digital WD Blue SN5000 4TB are both solid state drives with the same Capacity (4000 GB), Interface (PCIe Gen4 x4) and Form Factor (M.2-2280). The main differences are in Max Sequential Read and Max Sequential Write.

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SANDISK Optimus GX PRO 850X 4TB	Western Digital WD Blue SN5000 4TB
Prices (Change region) In Stock $999.99 In Stock Free shipping $999.99 In Stock $999.99 In Stock + $6.81 Shipping $1,499.99 Out of Stock Free shipping $1,517.00 Show 2 more offers	Prices (Change region) In Stock $445.00 Last updated 15 minutes ago. Out of Stock $449.99 Out of Stock $464.80 In Stock Free shipping $470.00 In Stock Free shipping $479.99 Show 2 more offers
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Brand SanDisk	Brand Western Digital
Model SDSP81400TAN-000E0 SDSP81400TAN	Model WDS400T4B0E WDBS3F0040BNC-WRSN
Release Date 📅 February 2026	Release Date -
* 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 $0.25	Price/GB $0.11
GB/$1 4	GB/$1 8.99
Series Optimus GX PRO 850X	Series Blue SN5000 NVMe
Capacity 4000 GB	Capacity 4000 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 3D NAND TLC	NAND Flash Type -
Max Sequential Read Up to 7300 MB/s	Max Sequential Read Up to 5500 MB/s
Max Sequential Write Up to 6600 MB/s	Max Sequential Write Up to 5000 MB/s
MTBF 1,750,000 hours	MTBF 1,750,000 hours