This Samsung 512MB PC2-4200U-444-12-D3 memory module is a DDR2 SDRAM type with a bus speed of PC2-4200 (DDR2-533). It has a form factor of a PC Card and includes one module with a total capacity of 512 MB and capacity per module of 512 MB. The model number is M378T6553cz0-cd5. This product is perfect for upgrading the memory of your computer, and it is compatible with various computer components. It is a reliable and efficient memory module that will enhance the performance of your computer system. Bid now and take advantage of this great opportunity!