The Hynix 512MB PC2100 DDR266 266Mhz 200pin DDR1 Sodimm Laptop Mem (Model: HYMD564M646A6-H) is a memory module specifically designed for laptops. With a total capacity of 512MB and a bus speed of PC-2100 (DDR-266), this SO-DIMM module from South Korea is reliable and efficient for enhancing the performance of your computer. The single module has 200 pins and is ideal for upgrading or replacing existing memory modules to improve your laptop's speed and efficiency.