This lot includes four 512MB Samsung DDR2 SDRAM modules with a bus speed of PC2-4200 (DDR2-533). Each module has a capacity of 512MB and is 1RX8. The model number is M378T6553CZ3-CD5 and the part number is 0543.

These modules are ideal for upgrading older computers or building a budget system. They have been tested and are in good working condition. Use them to boost your system's memory and improve its performance.