Product comparison · 2 internal solid state drives

Samsung PM863 120 GB 2.5" Serial ATA III vs Samsung PM951 128 GB M.2 PCI Express 3.0

Key differences

SSD capacity
- PM863 120 GB 2.5" Serial ATA III:120 GB
- PM951 128 GB M.2 PCI Express 3.0:128 GB
SSD form factor
- PM863 120 GB 2.5" Serial ATA III:2.5"
- PM951 128 GB M.2 PCI Express 3.0:M.2
Interface
- PM863 120 GB 2.5" Serial ATA III:Serial ATA III
- PM951 128 GB M.2 PCI Express 3.0:PCI Express 3.0
Read speed
- PM863 120 GB 2.5" Serial ATA III:380 MB/s
- PM951 128 GB M.2 PCI Express 3.0:600 MB/s
Write speed
- PM863 120 GB 2.5" Serial ATA III:125 MB/s
- PM951 128 GB M.2 PCI Express 3.0:150 MB/s
Product colour
- PM863 120 GB 2.5" Serial ATA III:Black
- PM951 128 GB M.2 PCI Express 3.0:Green

Differences highlightedShow differences only

Comparison of PM863, PM951
19 specifications	A Samsung PM863 120 GB 2.5" Serial ATA III Model PM863 View product	B Samsung PM951 128 GB M.2 PCI Express 3.0 Model PM951 View product
Features5 differ
SSD capacityDiffers	120 GB	128 GB
SSD form factorDiffers	2.5"	M.2
InterfaceDiffers	Serial ATA III	PCI Express 3.0
Data transfer rateKnown for one	6 Gbit/s	Unknown — not stated by the source
Read speedDiffers	380 MB/s	600 MB/s
Write speedDiffers	125 MB/s	150 MB/s
Random read (4KB)Known for one	86000 IOPS	Unknown — not stated by the source
Random write (4KB)Known for one	5000 IOPS	Unknown — not stated by the source
PCI Express interface data lanesKnown for one	Unknown — not stated by the source	x4
Weight & dimensionsidentical
WidthKnown for one	100.2 mm	Unknown — not stated by the source
DepthKnown for one	6.8 mm	Unknown — not stated by the source
HeightKnown for one	69.8 mm	Unknown — not stated by the source
WeightKnown for one	60 g	Unknown — not stated by the source
Operational conditionsidentical
Operating temperature (T-T)	0 - 70 °C	0 - 70 °C
Storage temperature (T-T)Known for one	-40 - 85 °C	Unknown — not stated by the source
Storage relative humidity (H-H)	5 - 95%	5 - 95%
Operating shock	1500 G	1500 G
Other features1 differ
Product colourDiffers	Black	Green
Internal	Yes	Yes

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.