Crucial BX500 240GB

The Crucial BX500 is Micron’s entry-level SATA storage solution that uses a DRAM-less architecture to reduce component complexity. It typically pairs a Silicon Motion controller (SM2258XT or SM2259XT) with Micron 3D NAND and relies on pseudo-SLC caching to mask native flash write speeds. Without a dedicated DRAM chip for mapping tables, the drive delivers strong burst performance for light workloads but can suffer significant speed degradation during sustained heavy writes once the SLC cache is exhausted. Early 240GB units shipped with TLC NAND, while newer batches may use QLC NAND without a model-number change, reducing endurance ratings and sustained write performance. The drive uses a plastic enclosure and a single-sided PCB, which can result in higher operating temperatures compared with metal-cased drives.

Key Specifications

• Interface: SATA III (6Gb/s)
• Sequential Read/Write: 540 MB/s / 500 MB/s
• Controller: Silicon Motion SM2258XT or SM2259XT (DRAM-less)
• NAND Type: Micron 3D TLC or QLC (variable based on revision)
• Form Factor: 2.5-inch 7mm
• Physical Traits: Thermal-insulating plastic chassis; Single-sided PCB design

Hardware Alternatives

• Kingston A400 240GB / SanDisk SSD Plus: Direct architectural competitors sharing the DRAM-less design and variability of internal components (controller and NAND) based on supply availability.
• Crucial MX500: Immediate hardware relative within the Micron stack; the BX500 is a stripped-down alternative that lacks the MX500's dedicated DRAM cache and metal enclosure.
• Western Digital WD Green 240GB: Functions as a direct performance peer, using similar DRAM-less controllers optimized for burst workloads rather than sustained throughput.