SANDISK Optimus GX PRO 850X 8TB Heatsink vs X400 M.2 256GB SSD Comparison

SANDISK Optimus GX PRO 850X 8TB Heatsink and SanDisk X400 M.2 256GB are both solid state drives with the same Form Factor (M.2-2280). The main differences are in Capacity, Interface and NVME.

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SANDISK Optimus GX PRO 850X 8TB Heatsink	SanDisk X400 M.2 256GB
Prices (Change region) In Stock Free shipping $2,699.99	Prices (Change region) In Stock Free shipping $99.99
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Brand SanDisk	Brand SanDisk
Model SDSP81800TAH-000E0 SDSP81800TAH	Model SD8SN8U-256G-1122
Release Date 📅 February 2026	Release Date 📅 November 2020
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★☆ (83 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Price/GB $0.34	Price/GB $0.39
GB/$1 2.96	GB/$1 2.56
Series -	Series X400
Capacity 8000 GB	Capacity 256 GB
Interface PCIe Gen4 x4	Interface SATA 6 Gb/s
NVME Yes	NVME No
Form Factor M.2-2280	Form Factor M.2-2280
NAND Flash Type -	NAND Flash Type TLC
Max Sequential Read -	Max Sequential Read Up to 540 MB/s
Max Sequential Write -	Max Sequential Write Up to 520 MB/s
MTBF -	MTBF Up to 1.75M hours