Crucial BX500 500GB

The Crucial BX500 500GB is a DRAM-less SATA drive that commonly pairs a Silicon Motion controller (SM2258XT or SM2259XT) with Micron 3D NAND. It relies on a portion of the NAND configured as pseudo-SLC to buffer write operations, prioritizing burst performance for light consumer workloads. The drive uses a plastic/polymer chassis, which provides less thermal dissipation than aluminum enclosures, and sustained write performance falls off sharply once the dynamic SLC cache is saturated.

Key Specifications

• Interface: SATA III (6 Gb/s)
• Sequential Speeds: 550 MB/s Read, 500 MB/s Write
• Controller: Silicon Motion SM2258XT / SM2259XT (DRAM-less)
• NAND Flash: Micron 3D NAND (TLC or QLC dependent on revision)
• DRAM: None (DRAM-less; uses pseudo-SLC as write buffer)
• Chassis: Plastic / Polymer composite
• Feature Set: SLC Write Acceleration, Multistep Data Integrity Algorithm, Thermal Monitoring

Hardware Alternatives

• Kingston A400: Functionally similar to the BX500, often utilizing the Phison S11 controller; both drives exhibit similar performance profiles regarding cache saturation and lack of DRAM.
• Western Digital WD Green 500GB: Utilizes a comparable DRAM-less architecture, often geared towards low-power consumption rather than sustained throughput.
• PNY CS900 500GB: Frequently shares the same Phison or SMI controller lineage as the BX500 depending on the production batch.