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

SANDISK Optimus GX PRO 850X 8TB Heatsink and Western Digital WD_BLACK SN8100 4TB 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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SANDISK Optimus GX PRO 850X 8TB Heatsink	Western Digital WD_BLACK SN8100 4TB Heatsink
Prices (Change region) In Stock Free shipping $2,699.99 In Stock Free shipping $2,766.30	Prices (Change region) In Stock Free shipping $899.99 (~~$999.99~~) $100.00 off w/ promo code: SBVF643, ends 6/14 In Stock Free shipping $999.99 In Stock $999.99
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Brand SanDisk	Brand Western Digital
Model SDSP81800TAH-000E0 SDSP81800TAH	Model WDS400T1XHM WDS400T1XHM-00CMT0
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 ★★★★☆ (23 reviews) Add a product review
Performance (Charts) n/a	Performance (Charts) 1st / 1746
Effective Value -	Effective Value 96th / 336
Price history View Details ►	Price history View Details ►
Price/GB $0.34	Price/GB $0.22
GB/$1 2.96	GB/$1 4.44
Series Optimus GX PRO 850X	Series -
Capacity 8000 GB	Capacity 4000 GB
Interface PCIe Gen4 x4	Interface PCIe Gen5 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 7200 MB/s	Max Sequential Read Up to 14900 MB/s
Max Sequential Write Up to 6600 MB/s	Max Sequential Write Up to 14000 MB/s
MTBF 1,750,000 hours	MTBF 1,750,000 Hours