Skip to main content
Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA III 2.5" 7mm (0.28") Internal Solid State Drive (SU128GBSS3A55S25AH)
SP Silicon Power

Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA III 2.5" 7mm (0.28") Internal Solid State Drive (SU128GBSS3A55S25AH)

Bottom line: The Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA: SLC cache absorbs write bursts for higher peak write speed; main trade-off: 128GB fills fast once Windows and updates are installed.

Check price on Amazon

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Check price on Amazon → Compare to similar ssds & storage

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ SLC cache absorbs write bursts for higher peak write speed
  • ✓ SLC layer cuts write amplification, extending drive lifespan
  • ✓ 7mm z-height fits standard laptop bays and 2.5in caddies
  • ✓ SATA III means no M.2 slot or NVMe support needed

Cons

  • ✗ 128GB fills fast once Windows and updates are installed
  • ✗ SATA III caps throughput far below any NVMe drive
  • ✗ No room for a modern game library at this capacity
  • ✗ SLC cache benefit fades on sustained large-file writes

Manufacturer description

The Silicon Power A55 128GB is a SATA III 2.5-inch internal SSD built for the job most small drives actually get: reviving an aging laptop or desktop that still boots from a mechanical hard drive. Silicon Power pairs 3D NAND with a dedicated SLC cache layer, so incoming writes land in the faster SLC portion first. That lifts peak write performance during everyday bursts like installing software or copying a project folder, and it reduces write amplification, which stretches the drive's usable lifespan. The 7mm (0.28 inch) z-height is the standard slim profile, so it drops into most laptop…

Related Products

Other products in this category you may like:

SpecPicks Verdict

SpecPicks scored Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA… using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. SP Silicon Power's ssds & storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for ssds & storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will this SSD fit in my laptop?

It is a 2.5-inch drive with a 7mm (0.28 inch) height, the standard slim size for laptop drive bays and 2.5-inch desktop mounts. Confirm your machine has a 2.5-inch SATA bay and not an M.2-only slot.

Is 128GB enough for Windows?

It is enough for a boot volume plus core applications, but not for a large game or media library. Most buyers at this capacity use it as the OS drive and keep bulk storage on a second drive.

What does the SLC cache actually do?

All incoming data is written to the SLC portion first, which raises peak write performance and reduces write amplification. The result is quicker bursts of writing and better endurance over the drive's life.

Does it come with cloning software?

Silicon Power's listing references a free downloadable utility for the A55 series. Check the current product listing or Silicon Power's support site for the exact software and download link before you buy.

Full Specifications

BrandSP Silicon Power
Model NameSU128GBSS3A55S25AH
Read Speed460 megabytes_per_second
Form Factor2.5-inch
Model NumberSU128GBSS3A55S25AH
Built-In Media1 x Silicon Power Ace A55 Solid State Drive
Hard Disk Size128 GB
Hard-Drive Size128 GB
Mfr Part NumberSU128GBSS3A55S25AH
Number of Items1
Special FeatureShock Resistant
Hardware Platformlaptop
Installation TypeInternal Hard Drive
Compatible DevicesLaptop
Data Transfer Rate500 megabytes_per_second
Enclosure MaterialNand Flash
Additional FeaturesShock Resistant
Hard Disk InterfaceSolid State
Customer Package TypeFFP
Hard Disk DescriptionSolid State Drive

Ready to buy?

Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA III 2.5" 7mm (0.28") Internal Solid State Drive (SU128GBSS3A55S25AH) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Check price on Amazon →

Related SSDs & Storage

Keep exploring SpecPicks

Other buying guides

Browse the catalog

Editorial

More guides & deep dives from the SpecPicks archive

Browse all articles & guides →

More reviews from the SpecPicks archive

Browse all reviews →

Earliest SpecPicks reviews

Browse full archive →
Silicon Power 128GB SSD 3D NAND A55 SLC Cache Performance Boost SATA III 2.5" 7mm (0.28") Internal Solid State Drive (SU128GBSS3A55S25AH)
View on Amazon →