The 4GB Black Diamond DDR2 Desktop RAM kit, manufactured by RAM, is a high-quality memory module designed for desktop computers. With a total capacity of 4GB split into 4GB per module, this DIMM RAM operates at a bus speed of PC2-5300 (DDR2-667) and features ECC memory. It comes with a lifetime manufacturer warranty, making it a reliable choice for expanding your computer's memory capacity for improved performance and efficiency.