Western Digital WD_BLACK SN8100 4TB vs SANDISK Optimus GX PRO 850X 8TB Heatsink SSD Comparison

Western Digital WD_BLACK SN8100 4TB and SANDISK Optimus GX PRO 850X 8TB Heatsink are both solid state drives with the same Form Factor (M.2-2280) and MTBF (1,750,000 Hours). The main differences are in Capacity, Interface, Max Sequential Read and Max Sequential Write.

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Western Digital WD_BLACK SN8100 4TB	SANDISK Optimus GX PRO 850X 8TB Heatsink
Prices (Change region) In Stock $789.00 Last updated 21 minutes ago. In Stock Free shipping $789.99 In Stock $789.99 In Stock Free shipping $789.99 In Stock $789.99 Out of Stock Free shipping $868.00 Show 3 more offers	Prices (Change region) In Stock Free shipping $2,699.99 In Stock Free shipping $2,766.30
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Brand Western Digital	Brand SanDisk
Model WDS400T1X0M WDS400T1X0M-00CMT0	Model SDSP81800TAH-000E0 SDSP81800TAH
Release Date 📅 May 2025	Release Date 📅 February 2026
* 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
Performance (Charts) 1st / 1746	Performance (Charts) n/a
Effective Value 85th / 336	Effective Value -
Price history View Details ►	Price history View Details ►
Price/GB $0.20	Price/GB $0.34
GB/$1 5.07	GB/$1 2.96
Series -	Series Optimus GX PRO 850X
Capacity 4000 GB	Capacity 8000 GB
Interface PCIe Gen5 x4	Interface PCIe Gen4 x4
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor M.2-2280
NAND Flash Type -	NAND Flash Type 3D NAND TLC
Max Sequential Read Up to 14900 MB/s	Max Sequential Read Up to 7200 MB/s
Max Sequential Write Up to 14000 MB/s	Max Sequential Write Up to 6600 MB/s
MTBF 1,750,000 Hours	MTBF 1,750,000 hours