The G.Skill 4GB DDR2-1066 PC2-8500 Desktop RAM is a high-quality memory upgrade for desktop computers. This RAM kit includes two 2GB modules with chips on both sides, providing a total capacity of 4GB. With a bus speed of PC2-8500 (DDR2-1066) and a voltage range of 1.8 - 2.1V, this DDR2 SDRAM is suitable for standard desktop use. The memory features include being unregistered, non-ECC, and unbuffered, making it a reliable choice for enhancing your computer's performance. The G. SKILL brand ensures quality and compatibility with your desktop system.