SANDISK Optimus GX PRO 850X 1TB Heatsink vs WD_BLACK SN770 2TB SSD Comparison

SANDISK Optimus GX PRO 850X 1TB Heatsink and WD_BLACK SN770 2TB are both solid state drives with the same Interface (PCIe Gen4 x4) and Form Factor (M.2-2280). The main differences are in Capacity, NAND Flash Type, Max Sequential Read and Max Sequential Write.

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SANDISK Optimus GX PRO 850X 1TB Heatsink	WD_BLACK SN770 2TB
Prices (Change region) In Stock $349.99 In Stock Free shipping $349.99 Out of Stock Free shipping $349.99 Out of Stock Free shipping $411.09 Show 1 more offers	Prices (Change region) Out of Stock Free shipping $312.55 In Stock $389.99 Last updated 23 minutes ago. Out of Stock $399.99
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Brand SanDisk	Brand Western Digital
Model SDSP81100TAH-000E0 SDSP81100TAH	Model WDS200T3X0E
Release Date 📅 February 2026	Release Date 📅 January 2022
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (20 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.35	Price/GB $0.16
GB/$1 2.86	GB/$1 6.4
Series Optimus GX PRO 850X	Series BLACK SN770 NVMe
Capacity 1000 GB	Capacity 2000 GB
Interface PCIe Gen4 x4	Interface PCIe Gen4 x4
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor M.2-2280
SSD Controller -	SSD Controller 20-82-10081-A1
NAND Flash Type 3D NAND TLC	NAND Flash Type 3D TLC BiCS5
Cache No DRAM (SLC)	Cache -
Max Sequential Read Up to 7300 MB/s	Max Sequential Read Up to 5150 MB/s
Max Sequential Write Up to 6300 MB/s	Max Sequential Write Up to 4850 MB/s
MTBF 1,750,000 hours	MTBF 1.75 Million hours