Silicon Power Ace A55 128GB

The Silicon Power Ace A55 M.2 utilizes the SATA III protocol over the M.2 2280 interface, distinguishing it from NVMe-based counterparts in the same form factor. The drive is designed around a DRAM-less architecture and relies on an SLC caching algorithm to manage burst data transfers rather than a dedicated SDRAM cache chip. While internal components are subject to revision, the drive typically pairs a 2-channel or 4-channel controller from Silicon Motion or Phison with commodity 3D TLC NAND. The Ace A55 uses a variable Bill of Materials strategy, so different batches of the 128GB model may feature the Silicon Motion SM2258XT, SM2259XT, or the Phison S11 controller. At 128GB the dynamic SLC cache is relatively small and users frequently report immediate write speed throttling once this buffer is saturated during large sequential transfers. Verify M.2 slot compatibility, as this is a Key B+M SATA drive and will not function in M.2 slots wired exclusively for PCIe/NVMe lanes.

Key Specifications

• Interface: SATA III (6Gb/s)
• Form Factor: M.2 2280 (Single-sided PCB)
• Max Sequential Read: 560 MB/s
• Max Sequential Write: 420 MB/s
• Controller: Variable (Commonly SM2258XT or Phison S11)
• NAND Type: 3D TLC
• DRAM Cache: No (DRAM-less)
• Feature Support: SLC Caching, ECC (Error Correction Code), S.M.A.R.T. monitoring

Hardware Alternatives

• TeamGroup MS30 / WD Green (SATA M.2): Direct architectural competitors sharing the same M.2 SATA III limitation and typically utilizing similar DRAM-less controllers for comparable sustained performance
• Kingston A400 (M.2 Revision): Close hardware relative, utilizing similar Phison S11 controllers in many revisions with nearly identical throughput and endurance profiles
• Crucial MX500 (M.2 SATA): Represents the technical ceiling for this form factor; unlike the Ace A55, the MX500 utilizes a controller with dedicated DRAM, offering higher sustained write performance and random I/O stability