The Qimonda 2GB PC2-4200F DDR2-533 2RX4 ECC memory module is a high-quality RAM memory specific for computer systems. With a total capacity of 2GB divided into two 1GB modules, this DDR2 memory operates at a fast bus speed of PC2-4200 (DDR2-533). It also features ECC memory, which stands for Error Correction Code, ensuring data accuracy and reliability. This memory module is a reliable choice for upgrading or replacing existing RAM memory in desktop or server computers to improve overall system performance and stability.Have kit of 4, can combine shipping