The Cisco 2851 provides significant additional value compared to prior generations of Cisco routers at similar price points by offering up to a fivefold performance improvement, up to a tenfold increase in security and voice performance, new embedded service options, and dramatically increased slot performance and density while maintaining support for most of the more than 90 existing modules that are available today for the Cisco 1700, Cisco 2600, and Cisco 3700 Series. Memory Standard Memory: 256MB Maximum Memory: 1GB Memory Technology: DRAM Flash Memory: 64 MB OS: Cisco 2800 IOS IP BASE