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Plextor M5 Pro Xtreme 256GB / M5S 256GB SSD review: one is cheap, the other faster?

One is cheaper, but is the other one faster?

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Plextor M5S

The Plextor M5S series is in fact an upgrade of the existing Plextor M3 and M3 Pro models. Those SSDs have the older Marvell 88SS9174 controller, and not the new chip used for the M5 Pro zit. That 88SS9174 controller has been used in many SSDs, including the Plextor M3s.

Plextor M5S 256GB

The flash memory that Plextor used for thee M5S is 'standard' 25 nm ONFI NAND from the Micron/Intel factory. The M5S is available in 64 GB, 128 GB and 256 GB models. All three have an indicated maximum read speed of 520 MB/s, and the maximum read speeds are 90, 200 and 390 MB/s, respectively. The buffer memory of the three models is 128, 256 and 512 MB.

Since the M5S is positioned lower than the M5 Pro, the package it comes with isn't as comprehensive. All you get is the SSD, no brackets or migration software. The M5S also only has 3 years of warranty as opposed to the 5 years you get with the M5 Pro.

Plextor M5S 256GB

Hardware-wise the M5S isn't very exciting. We've known the Marvell chip for years, and we've seen the 25nm Micron NAND in dozens of SSDs. However, Plextor claims the M5S has improved firmware and is faster than the M3 SSDs. Let's see whether the benchmark results confirm that.

General
 
BrandPlextorPlextorPlextor
Product nameM5S 128GBM5S 256GBM5S 64GB
Product codePX-128M5SPX-256M5SPX-64M5S
DetailsProduct infoProduct infoProduct info
Specifications
Disc typeSSDSSDSSD
SSD typeMulti-level cellMulti-level cellMulti-level cell
Quoted capacity128 GB256 GB64 GB
Price per gigabyte£ 0,594 / GB£ 0,530 / GB
Rotation speed0 rpm0 rpm0 rpm
Cache256 MB512 MB128 MB
Size2.5 inch2.5 inch2.5 inch
Height9.5 mm9.5 mm9.5 mm
InterfaceSerial ATA 600Serial ATA 600Serial ATA 600
SSD controllerMarvell 88SS9174Marvell 88SS9174Marvell 88SS9174
Power connectorSATASATASATA
Measured capacity238 GB
Native Command Queuing
TRIM support
Read520 MB/s520 MB/s520 MB/s
Write200 MB/s390 MB/s90 MB/s
Transistor size flash chips25 nm25 nm25 nm
Flash chip brandMicronMicronMicron
Warranty3 year(s)3 year(s)3 year(s)


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