Samsung 840 PRO 128GB vs 850 Pro 128GB SSD Comparison

Samsung 840 PRO 128GB and Samsung 850 Pro 128GB are both solid state drives with the same Capacity (128 GB), Interface (SATA 6 Gb/s) and Form Factor (2.5"). The main differences are in Performance (+10%), SSD Controller, NAND Flash Type and MTBF.

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Samsung 840 PRO 128GB	Samsung 850 Pro 128GB
Prices (Change region) Out of Stock Free shipping $149.99 - Buy now	Prices (Change region) In Stock Free shipping $199.99
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Pangoly Score (How do we rate?) 92	Pangoly Score (How do we rate?) 93
Brand Samsung	Brand Samsung
Model MZ-7PD128BW	Model MZ-7KE128BW
Release Date 📅 October 2012	Release Date 📅 July 2014
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews ★★★★★ (235 reviews) Add a product review	User reviews ★★★★★ (198 reviews) Add a product review
Performance (Charts) 258th / 1746 (-10%)	Performance (Charts) 227th / 1746 (0%)
Effective Value 261st / 336	Effective Value 269th / 336
Price history View Details ►	Price history View Details ►
Price/GB $1.17	Price/GB $1.56
GB/$1 0.85	GB/$1 0.64
Pros Great performance Samsung MDX controller	Pros Great performance Ten-year warranty Samsung MEX controller
Cons -	Cons Not cheap
Series 840 Pro Series	Series 850 PRO
Capacity 128 GB	Capacity 128 GB
Interface SATA 6 Gb/s	Interface SATA 6 Gb/s
NVME No	NVME No
Form Factor 2.5"	Form Factor 2.5"
SSD Controller Samsung MDX	SSD Controller Samsung MEX
NAND Flash Type MLC	NAND Flash Type 3-D Vertical
Max Sequential Read -	Max Sequential Read Up to 550 MB/s
Max Sequential Write -	Max Sequential Write Up to 470 MB/s
MTBF 1,500,000 hours	MTBF 2,000,000 hours