Silicon Power Slim S55 SP480GBSS3S55S25 480GB 2.5-inch SATA III Internal SSD 500/450 MB/s 3D NAND Black
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Silicon Power
Silicon Power Slim S55 SP480GBSS3S55S25 480GB 2.5-inch SATA III Internal SSD 500/450 MB/s 3D NAND Black
€122.77 inc. VAT
SP480GBSS3S55S25
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Silicon Power Slim S55 480GB — 2.5-inch SATA III SSD, 500/450 MB/s
500 / 450 MB/s2.5-inch SATA III150 TBW · 3-year term3D NAND with SLC cache
The Silicon Power Slim S55 SP480GBSS3S55S25 is a 480GB 2.5-inch SATA III solid state drive in the standard 7 mm height, rated by Silicon Power at up to 500 MB/s read and 450 MB/s write — the top of the interface, and the faster half of this family’s capacity ladder. It is the straightforward upgrade for a laptop or desktop still running a mechanical hard drive: the same bay, the same cable, and a machine that boots and opens applications in a fraction of the time. At 480GB there is room for Windows, applications and a working library rather than just the system. The drive uses 3D NAND with an SLC cache layer and carries a 150 TBW endurance rating with a 3-year manufacturer term behind it.
Compatibility — check before buying:
This is a 2.5-inch SATA drive, 100 x 69.9 x 7.0 mm. It fits any laptop or desktop bay that takes a 2.5-inch drive and any SATA port — it does not go into an M.2 slot, and it is not an NVMe drive. A desktop with only 3.5-inch bays needs a mounting bracket, and a desktop build needs a SATA data cable and a power connector: Silicon Power does not publish a package contents list for this drive, so assume the drive alone and tell us if you need the bracket or cable added to the order. Note also that no hardware encryption is published for the S55 — there is no AES or TCG Opal claim anywhere on Silicon Power’s specification for it, so if your organisation requires a self-encrypting drive, this is not one. If you are replacing a drive in a specific laptop and want to be sure of the fit, send us the model and we will check it.
Best For
✓ Replacing a mechanical hard drive in a laptop
✓ Adding a fast system drive to an older desktop
✓ A second drive for games or projects alongside an existing SSD
✓ Refreshing an office fleet where NVMe is not an option
✓ Machines whose motherboard has no M.2 slot
✓ A low-cost, low-risk speed upgrade on ageing hardware
Key Features
500 / 450 MB/s at 480GB
Silicon Power rates the 480GB and 960GB at 500 MB/s read, while the 120GB and 240GB are quoted at 460. This capacity is therefore genuinely faster as well as larger, and 500 MB/s is essentially the ceiling of the SATA III interface itself.
3D NAND with SLC caching
Incoming writes land in a fast SLC region and are copied to the main 3D NAND afterwards, which keeps everyday write bursts quick. Silicon Power describes the copy as happening internally rather than through the host, so it does not tie up the system while it works.
150 TBW with a 3-year term
Endurance is rated at 150 terabytes written for the 480GB, double the figure for the 240GB. Silicon Power’s warranty runs for 3 years or until that figure is exceeded, whichever comes first — for a normal desktop or laptop workload, 150 TBW is many years of writing.
Built to take a knock
Rated to 1500G shock and 20G vibration with an estimated MTBF of 1,500,000 hours, and with no moving parts at all. TRIM, S.M.A.R.T., NCQ, ECC, bad block management and wear levelling are all supported, and Silicon Power offers its SP ToolBox monitoring utility as a free download.
Technical Specifications
Frequently Asked Questions
Singular Expert Insight
The honest case for a SATA SSD in 2026 is fit, not speed. If the machine has an M.2 slot, an NVMe drive is the better buy and it is not close. If it does not — and a great many working laptops and office desktops still do not — then this is the upgrade that transforms them, and the jump from a mechanical hard drive to 500 MB/s is far larger than the jump from SATA to NVMe would be. Within the S55 family the 480GB is the sensible middle: it reads at 500 MB/s where the 120GB and 240GB are held to 460, and its 150 TBW endurance is double the 240GB’s. Watch the capacity ladder rather than the family name when comparing — the S55 runs 120, 240, 480 and 960GB, while the similarly named Ace A55 runs 128, 256, 512GB and 1TB, so the two lines never line up on capacity and are not interchangeable line items. At 480GB you have room for Windows, applications and a working set of files, which is where most single-drive machines want to be.
Buyer’s Guide
Buy it if
Your laptop or desktop still runs a mechanical hard drive and has a 2.5-inch bay. Your motherboard has no M.2 slot, so NVMe is not an option. You want one drive to hold Windows, applications and your working files rather than the system alone. You want the faster half of the range, at 500 MB/s read and 150 TBW.
Skip it if
Your machine has a free M.2 NVMe slot — you would be leaving most of the performance on the table. You need bulk storage for games or video, where 240GB fills quickly. You require a self-encrypting drive, which this model does not claim. You need the drive to arrive with a bracket and cable as standard.
Also consider
The 240GB Slim S55 if you only need a system drive and want to spend less, bearing in mind it is rated 460 MB/s and 75 TBW. A Silicon Power NVMe drive such as the UD90 if the machine has an M.2 PCIe slot. A 2.5-to-3.5-inch mounting bracket and a SATA cable for a desktop install. An external enclosure so the old drive can be reused for backups.
Features - Silicon Power - SP480GBSS3S55S25
Colour
black
Interface
- SATA
More Details
Product Code
04:188633
EAN Code
4712702629408
Manufacturer
Silicon Power
Technical specifications
Capacity
480GB