The MEM8XX-512U768D is a third-party memory module designed for Cisco 880/890 series routers, offering a total capacity of 512 MB to 768 MB, with each module providing 512 MB of DDR2 SDRAM memory. Manufactured in the United States, this SO-DIMM form factor memory module is a reliable and high-quality component for enhancing the performance of your networking devices. With the trusted Cisco brand and compatibility with specific router models, this memory module provides a seamless upgrade and ensures optimal performance for your networking needs.