The Hynix HMT351S6CFR8C-PB 4 GB 2RX8 DSR3 Laptop Memory is a high-quality RAM module designed for laptops. It features a total capacity of 8GB with each module having a capacity of 4GB, making it ideal for upgrading or replacing memory modules in laptops. The SO-DIMM form factor, DDR3 SDRAM type, and 204 pins ensure compatibility with a wide range of laptops. With a bus speed of PC3-12800 (DDR3-1600) and ECC memory features, this product offers reliable performance and error correction for a seamless computing experience.