Product comparison · 2 internal solid state drives

Samsung 840 EVO vs Samsung 850 PRO

Key differences

Differences highlightedShow differences only

Comparison of 840 EVO, 850 PRO
31 specifications	A Samsung 840 EVO View product	B Samsung 850 PRO View product
Features6 differ
SSD capacityDiffers	120 GB	128 GB
Memory typeDiffers	MLC	3D MLC
Read speedDiffers	540 MB/s	550 MB/s
Write speedDiffers	410 MB/s	470 MB/s
Random read (4KB)Differs	94000 IOPS	100000 IOPS
Random write (4KB)Differs	35000 IOPS	90000 IOPS
Mean time between failures (MTBF)Known for one	Unknown — not stated by the source	2000000 h
TBW ratingKnown for one	Unknown — not stated by the source	150
Storage drive buffer sizeKnown for one	256 MB	Unknown — not stated by the source
Windows operating systems supportedKnown for one	Yes	Unknown — not stated by the source
Poweridentical
Power consumption (read)Known for one	Unknown — not stated by the source	3.3 W
Power consumption (idle)Known for one	Unknown — not stated by the source	0.4 W
Weight & dimensions3 differ
WidthDiffers	69.8 mm	100 mm
DepthDiffers	100 mm	6.8 mm
HeightDiffers	7 mm	69.8 mm
WeightKnown for one	68 g	Unknown — not stated by the source
Operational conditionsidentical
Non-operating vibrationKnown for one	Unknown — not stated by the source	20 G
Non-operating shockKnown for one	Unknown — not stated by the source	1500 G
Other features1 differ
Product colourDiffers	Titanium	Black
Operating temperature (T-T)Known for one	Unknown — not stated by the source	32 - 158 °F

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.