The M51264J90SFR by Kingston Retail is a proprietary DDR3 SODIMM memory module, specifically engineered for electronic devices that require a bespoke memory solution. This module offers a 4GB capacity with a DDR3-1333 512Mx64 configuration, catering to the needs of users looking for a balance between performance and capacity in their upgrades or replacements. Designed to fit into DDR3 1333 SODIMM 204pin slots, it is compatible with a wide range of devices, providing a versatile option for enhancing system performance. Kingston's reputation for high-quality memory products ensures that this module delivers reliability and speed, making it an ideal choice for users aiming to boost their device's efficiency and multitasking capabilities. The M51264J90SFR stands out for its proprietary design, aimed at specific systems that require tailored memory specifications, offering an effective solution for upgrading specialized computing devices or systems with unique memory needs.