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Green rectangular M.2 2280 circuit board with gold edge connector and black controller chip

Plextor

Plextor PX-256S2G 256GB M.2 2280 SATA internal SSD

SKU CH-MEWK-762M9 MPN PX-256S2G

256 GB M.2 2280 SATA SSD delivering 520 MB/s read, 480 MB/s write and 96K/73K IOPS with 512 MB DDR3 cache

  • Total capacity256 GB
  • Sequential read speedUp to 520 MB/s
  • Sequential write speedUp to 480 MB/s
  • Interface typeSATA III
  • Form factorM.2 2280
  • Product typeInternal Solid State Drive (SSD)
  • M.2 2280 form factor fits slim laptops and desktops
  • SATA III interface delivers up to 520 MB/s sequential read speed
  • 512 MB DDR3 cache boosts random read to 96,000 IOPS
  • PlexNitro SLC cache technology provides full 256 GB usable capacity
  • 5 million-hour MTBF and 1500 G shock resistance ensure long-term reliability

256GB M.2 2280 SATA SSD

The Plextor S2G is a 256GB internal solid-state drive built in the M.2 2280 form factor with a SATA III interface. It uses TLC NAND flash and an SMI SM2258 controller backed by 512MB of DDR3 cache. The drive targets consumers looking for a straightforward storage upgrade for compatible laptops or desktops.

Suits SATA M.2 slots; not for PCIe-only boards

This drive fits systems that accept M.2 2280 modules running SATA signalling. It will not operate in slots wired exclusively for PCIe protocols. Buyers should verify their motherboard or laptop documentation confirms SATA support on the M.2 socket before purchase.

Sequential read up to 520 MBps

The specifications list a maximum sequential read speed of 520 MBps and a maximum sequential write speed of 480 MBps. Random read reaches 96,000 IOPS while random write reaches 73,000 IOPS. These figures define the performance ceiling for boot, application loading and file transfer workloads.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $70.99
Cheaper than about 82% of the 1,994 comparable items (median $180.49).
Total capacity 256 GB
Lower than about 80% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 520 MB/s
Lower than about 90% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $277.30 per TB
Pricier than about 73% of the 1,362 comparable items (median $165.50 per TB).

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Specifications

Product
Brand namePlextor
Product lineS2G
Model namePX-256S2G
Total capacity256 GB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 520 MB/s
Sequential write speedUp to 480 MB/s
Random read (4K)Up to 96,000 IOPS
Random write (4K)Up to 73,000 IOPS
Storage
NAND flash typeTLC
Controller chipSMI SM2258
Cache memory512 MB DDR3
Ports & slots
Interface typeSATA III
Size & build
Form factorM.2 2280
Overall height2.3 mm
Overall width22 mm
Product depth80 mm
Product weight0.35 oz
Shipping weight0.02 kg
Package size154 × 48 × 17 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Max shock tolerance1500G (Max.), at 1 msec hal f-sine
Vibration tolerance7 to 800 Hz, 3.08Grms (Operating)
More details
Mean time between failures1,500,000 h

Questions about this item

Which capacity should I pick among the 128 GB, 256 GB and 512 GB options?

The 256 GB model gives you the full advertised space because PlexNitro SLC caching removes the need for over-provisioning, unlike drives that reserve 120 GB out of 128 GB.

What do the 520 MB/s read and 480 MB/s write figures mean once the drive is installed?

They are SATA III sequential limits, so large file copies and OS boot will hit those speeds, while everyday mixed workloads run at the 96K read and 73K write IOPS random rates.

What does the SATA III interface on an M.2 2280 drive cap in practice?

The SATA III link tops out at 6 Gb/s, so even though the drive uses the M.2 2280 slot, throughput cannot exceed the 520/480 MB/s sequential ceiling.

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