Western Digital BLACK SN850X 4TB vs Samsung 990 PRO 4TB SSD Comparison

Western Digital BLACK SN850X 4TB and Samsung 990 PRO 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 Performance (+19%), SSD Controller and NAND Flash Type.

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Western Digital BLACK SN850X 4TB	Samsung 990 PRO 4TB
Prices (Change region) In Stock $599.99 Last updated 40 minutes ago. In Stock Free shipping $599.99 Out of Stock Free shipping $599.99 Out of Stock + $39.99 Shipping $596.86 In Stock $799.99 Show 2 more offers	Prices (Change region) In Stock $895.00 Last updated 41 minutes ago. In Stock Free shipping $949.00 Out of Stock Free shipping $999.95 In Stock Free shipping $1,099.99 In Stock $1,099.99 In Stock Free shipping $1,099.99 Out of Stock $1,213.97 Show 4 more offers
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Brand Western Digital	Brand Samsung
Model WDS400T2X0E	Model MZ-V9P4T0B/AM MZ-V9P4T0BW
Release Date 📅 August 2022	Release Date 📅 September 2023
* 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) 25th / 1746 (0%)	Performance (Charts) 33rd / 1746 (-19%)
Effective Value 65th / 336	Effective Value 105th / 336
Price history View Details ►	Price history View Details ►
Price/GB $0.15	Price/GB $0.22
GB/$1 6.67	GB/$1 4.47
Series BLACK SN850X NVMe	Series -
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
SSD Controller 20-82-20035-B1	SSD Controller Samsung Pascal
NAND Flash Type BiCS5 112-layer TLC	NAND Flash Type V7 V-NAND 3bit MLC
Max Sequential Read Up to 7300 MB/s	Max Sequential Read -
Max Sequential Write Up to 6600 MB/s	Max Sequential Write -
MTBF 1.75M Hours	MTBF -