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Silicon Power Ace A55

Silicon PowerSSD

Ace A55

Released November 2017.5Reviewwarp2search.net/story/silicon-power-ace-a55-256gb-3d-nand-ssd-review-madshrimpsRead 15 October 2026Warp2Search carries the Madshrimps review of the Silicon Power A55 256GB 3D NAND SSD, published November 27, 2017. It is the earliest dated evidence found for the A55 name. The page did not state the speeds or the controller of the model sold today, so neither is stored. A Wayback capture of the maker's regional Ace A55 page exists from 2019-03-28. Last checked 21 October 2026.

Interface
SATA
Form factor
2.5-inch
Capacity
128 GB, 256 GB, 512 GB, 1 TB, 2 TB, 4 TB, 8 TB, 16 TB
Read speed
500MB/s

19 of 63 fields known.

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All specs

SourceCalculated

General

Series
Not available
Model numbers
SP128GBSS3A55S25, SPJ128GBSS3A55B, SU128GBSS3A55S25EU, SP256GBSS3A55S25, SPJ256GBSS3A55B, SU256GBSS3A55S25EU, SU256GBSS3A55S25AH, SP512GBSS3A55S25, SPJ512GBSS3A55B, SU512GBSS3A55S25EU, SP001TBSS3A55S25, SPJ001TBSS3A55B, SU001TBSS3A55S25EU, SU001TBSS3A55S25AC, SP002TBSS3A55S25, SPJ002TBSS3A55B, SU002TBSS3A55S25EU, SU002TBSS3A55S25SN, SP004TBSS3A55S25, SPJ004TBSS3A55B, SP004TBSS3A55S25AY, SP008TBSS3A55S25, SP016TBSS3A55S251Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026The price table lists a P/N per capacity. Each capacity has an SP, an SPJ and an SU code, and some have a regional suffix such as EU, AC, SN or AY. The page does not say what the prefixes and suffixes mean. They are stored as one list per capacity.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026Ordering Information lists only 2TB SP002TBSS3A55S25, 4TB SP004TBSS3A55S25, 8TB SP008TBSS3A55S25 and 16TB SP016TBSS3A55S25, and says more part numbers are available from sales.3Maker product pageweb.archive.org/web/20251216203842/https://sp-siliconpower.com/products/a55-128gb-2tb-sata-iii-2-5-inch-internal-solid-state-driveRead 21 October 2026The US store sells the 256GB as SU256GBSS3A55S25AH, a code that the global page does not list. It is added to the 256GB list
GTIN / EAN
886576030425, 886576078304, 886576030449, 886576030456, 886576037912, 8865760696783Maker product pageweb.archive.org/web/20251216203842/https://sp-siliconpower.com/products/a55-128gb-2tb-sata-iii-2-5-inch-internal-solid-state-driveRead 21 October 2026Variant barcodes from the store page data of the same capture: 886576030425 (128GB, SP128GBSS3A55S25), 886576078304 (256GB, SU256GBSS3A55S25AH), 886576030449 (512GB, SP512GBSS3A55S25), 886576030456 (1TB, SP001TBSS3A55S25), 886576037912 (2TB, SP002TBSS3A55S25), 886576069678 (4TB, SP004TBSS3A55S25). These are 12-digit UPCs for the US store. EAN barcodes for other markets are not stored, since the retailer listings that show them disagree on the part number
Announced
Not available
Status
Available1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026The page is live and lists the drive with a purchase tab.
Predecessor
Not available
Successor
Not available
Launch price (US)
Not available
Launch price (EU)
Not available
Markets
Not available
Colours
Not available
Form factor
2.5-inch1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 20262Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026
Capacity
128 GB, 256 GB, 512 GB, 1 TB, 2 TB, 4 TB, 8 TB, 16 TB1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Capacity row reads 128GB, 256GB, 512GB, 1TB, 2TB, 4TB, 8TB, 16TB. The datasheet footnote says 1GB equals 1 billion bytes.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026

Interface

Interface
SATA1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 20262Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026
PCIe generation
Not available
PCIe lanes
Not available
NVMe version
Not available
Detachable cable
Not available

Hardware

We could not find any of these 7 fields. Show them
Controller
Not available
Flash type
Not available
Flash memory
Not available
Flash layers
Not available
DRAM cache
Not available
DRAM cache size
Not available
Component sides
Not available

Performance

Sequential read (claimed)
500MB/s1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Performance Read (max.) row: 460 MB/s for 128GB and 256GB, 500 MB/s for 512GB and up. The base is the 2TB model. No test tool or host is named. The page note says results vary with platform, software, interface and capacity.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026
Sequential write (claimed)
450MB/s1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Performance Write (max.) row: 360 MB/s for 128GB, 450 MB/s for 256GB and up. The base is the 2TB model.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026
Random 4K read (claimed)
Not available
Random 4K write (claimed)
Not available

Endurance and reliability

Endurance (TBW)
600TB4Maker spec sheet (PDF)silicon-power.com/document/ssd_tbwRead 15 October 2026Silicon Power SSD TBW table, file dated 2026-08-05. The A55 row of the SATA III 2.5 inch table lists 37 TB (128GB), 75 (256GB), 150 (512GB), 300 (1TB), 600 (2TB), 1200 (4TB) and 2400 (8TB). 16TB is not in the table. The separate A55 M.2 row is a different product.
MTBF or MTTF (claimed)
1,500,000h1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026MTBF (est) row reads 1,500,000 hours. The datasheet row says MTBF (test) with the same value. Stored as MTBF.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026MTBF (test) 1,500,000 hours.
Operating temperature
Min0Max70°C3Maker product pageweb.archive.org/web/20251216203842/https://sp-siliconpower.com/products/a55-128gb-2tb-sata-iii-2-5-inch-internal-solid-state-driveRead 21 October 2026Silicon Power's own US store page for the A55 128GB-4TB, archived 2025-12-16, Product Specifications: Operating temperature 0 C to 70 C and storage temperature -40 C to 85 C (only the operating range is stored). The same page lists the same MTBF, shock and vibration ratings and warranty as the 2026 global page. The global page and the 2026 flyer no longer print a temperature range, and the live US page no longer shows it either

Power

We could not find any of these 6 fields. Show them
Power while reading (claimed)
Not available
Power while writing (claimed)
Not available
Max power consumption (claimed)
Not available
Average power in light use (claimed)
Not available
Idle power (claimed)
Not available
Sleep power (claimed)
Not available

Measured

We could not find any of these 9 fields. Show them
Sequential read (measured)
Not available
Sequential write (measured)
Not available
Random 4K read at queue depth 1 (measured)
Not available
Random 4K write at queue depth 1 (measured)
Not available
Write cache size (measured)
Not available
Write speed after the cache (measured)
Not available
3DMark Storage Benchmark
Not available
Highest temperature under load (measured)
Not available
Idle power (measured)
Not available

Cooling and build

Heatsink
Without heatsink1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026The page shows one plain 2.5 inch case and lists no heatsink version.
RGB lighting
Not available
Dust and water rating
Not available
Drop test height
Not available

Security and software

Security
Not available
Software
SP ToolBox1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Free download of SP ToolBox for disk information, SMART report, wear extent and diagnostics. The datasheet says the performance test and secure erase features are for industrial SSDs only.

Compatibility

Platforms
PC (no OS named)1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Page title reads SP Ace A55 2.5" SATA SSD for Laptops & PCs. No operating system is named, so PC is stored

Dimensions and weight

Front and side, drawn to scale.

Dimensions
Length100Width69.9Height7mm(3.9 × 2.8 × 0.3 in)1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Dimensions row reads 100.0 x 69.9 x 7.0 mm. One value for every capacity.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026
Weight
63g(2.2 oz)1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 2026Weight row reads 63g (max.). One value for every capacity. A 2.5 inch case weighs more than an M.2 drive.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026

In the box

We could not find any of these 2 fields. Show them
In the box
Not available
Cables included
Not available

Warranty

Manufacturer warranty (source market)
3years1Maker product pagesilicon-power.com/product-detail/Ace_A55Read 15 October 20263-year limited warranty. The page says the warranty is based on the TBW or the warranty period.2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ace-a55Read 15 October 2026

Compare with

Pick a SSD to see both side by side. Differences are marked yellow.

More SSD comparisons

Variants

Each variant lists only what differs from the specs above.

Model numberModel numbersGTIN / EANCapacitySequential read (claimed)Sequential write (claimed)Endurance (TBW)
SP128GBSS3A55S25SP128GBSS3A55S25, SPJ128GBSS3A55B, SU128GBSS3A55S25EU886576030425128 GB460 MB/s360 MB/s37 TB
SP256GBSS3A55S25SP256GBSS3A55S25, SPJ256GBSS3A55B, SU256GBSS3A55S25EU, SU256GBSS3A55S25AH886576078304256 GB460 MB/s450 MB/s75 TB
SP512GBSS3A55S25SP512GBSS3A55S25, SPJ512GBSS3A55B, SU512GBSS3A55S25EU886576030449512 GB500 MB/s450 MB/s150 TB
SP001TBSS3A55S25SP001TBSS3A55S25, SPJ001TBSS3A55B, SU001TBSS3A55S25EU, SU001TBSS3A55S25AC8865760304561 TB500 MB/s450 MB/s300 TB
SP002TBSS3A55S25SP002TBSS3A55S25, SPJ002TBSS3A55B, SU002TBSS3A55S25EU, SU002TBSS3A55S25SN8865760379122 TB500 MB/s450 MB/s600 TB
SP004TBSS3A55S25SP004TBSS3A55S25, SPJ004TBSS3A55B, SP004TBSS3A55S25AY8865760696784 TB500 MB/s450 MB/s1,200 TB
SP008TBSS3A55S25SP008TBSS3A55S25Not available8 TB500 MB/s450 MB/s2,400 TB
SP016TBSS3A55S25SP016TBSS3A55S25Not available16 TB500 MB/s450 MB/sNot available

Sources

We read 5 sources for this SSD. The numbers match the markers in the sheet.

  1. Read 15 October 2026Backs 16 fields
  2. Read 15 October 2026Backs 11 fields
  3. Read 21 October 2026Backs 4 fields
  4. Read 15 October 2026Backs 1 field
  5. Read 15 October 2026Backs 1 field

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