The Hynix DDR2 400mhz PC2-3200 ECC RDIMM 4GB D2/51272R40MU EMS is a high-quality memory module designed for computer systems. With a total capacity of 4GB divided into 1 module, it offers fast performance at a bus speed of PC2-3200 (DDR2-400). This module features ECC memory, registered capabilities, and is ideal for systems requiring reliable and error-correcting memory technology. The form factor of RDIMM ensures compatibility with a wide range of computer systems, making it a versatile option for enhancing system performance and efficiency.