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Silver 2.5 inch rectangular SSD with label on top

Silicon Power

Silicon Power Ace A55 256GB 2.5" internal SSD

SKU CH-XB0Q-SA9F5

A 2.5-inch SATA internal SSD with 256GB capacity, 3D NAND memory, up to 460 MBps read and 450 MBps write speeds, plus SLC cache for improved performance and endurance

  • Total capacity256 GB
  • Sequential read speedUp to 460 MB/s
  • Sequential write speedUp to 450 MB/s
  • Interface typeSATA III
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)

Capacity 256GB

  • Faster boot and app loading with up to 460 MB/s read speed
  • Sustained write performance up to 450 MB/s via SLC cache technology
  • 3D NAND flash delivers higher endurance and better power efficiency
  • 5-inch 7mm form factor fits ultrabooks and standard laptops
  • 5 million hour MTBF plus 1500G shock resistance for reliability

Silicon Power Ace A55 256GB SATA SSD

The Silicon Power Ace A55 is a 256GB internal solid state drive built for laptops and desktops with a 2.5-inch SATA bay. It uses 3D NAND flash to replace a mechanical hard drive, delivering faster boot times and snappier application launches for everyday computing.

Sustained write behaviour with SLC cache

The drive employs SLC cache technology to absorb incoming writes at higher speeds before folding data into the main 3D NAND array. This approach reduces write amplification during prolonged workloads, helping the drive maintain consistent throughput and extending its usable lifespan.

Thermals, noise and power draw

With no moving parts, the Ace A55 runs silently and produces minimal heat inside a laptop chassis. The 3D NAND architecture improves power efficiency over older 2D NAND designs, reducing the load on the system battery and allowing longer unplugged sessions without active cooling.

How it compares

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

Price $35.99
Cheaper than about 94% 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 460 MB/s
Lower than about 91% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $140.59 per TB
Cheaper than about 62% of the 1,362 comparable items (median $165.50 per TB).

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Specifications

Product
Brand nameSilicon Power
Product lineAce A55
Model nameSU256GBSS3A55S25AH
Part numberSU256GBSS3A55S25AH
Total capacity256 GB
Product typeInternal Solid State Drive (SSD)
Performance
Sequential read speedUp to 460 MB/s
Sequential write speedUp to 450 MB/s
Storage
NAND flash type3D NAND
Connectivity
Connection protocolSATA
Ports & slots
Interface typeSATA III
Size & build
Form factor2.5 in (6.35 cm)
In the box
Included items1 x Silicon Power Ace A55 Solid State Drive
Environment & compliance
Max shock tolerance1500G
Vibration tolerance20G
More details
Mean time between failures1,500,000 h

Other versions of this model

5 more in the same range

Questions about this item

Does the 2.5-inch drive stay cool and quiet when running all day?

With no moving parts and a SATA interface limited to 460 MBps read and 450 MBps write, the Ace A55 produces minimal heat and runs silently during continuous operation.

What cable or bracket do I need to install this 2.5-inch SATA SSD?

A standard SATA data cable and a SATA power connector from the power supply are required; the 7 mm height fits most drive bays without an extra bracket.

Will this SATA SSD work alongside my older mechanical hard drive?

Yes, the drive uses the same SATA III interface as legacy hard drives so both can run on the same controller without conflicts.

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