The Hynix HMT351S6EFR8A-PB laptop RAM is a 4GB DDR3 SDRAM module with a total capacity of 4GB. It features a SO-DIMM form factor with 204 pins and a bus speed of PC3-12800 (DDR3-1600). This RAM is designed for high performance and reliability, making it suitable for various computing tasks and applications. The memory features of being fully buffered ensure stable and efficient data transfer, providing a seamless experience for users.