Features:
512MB DDR SDRAM for Cisco 3800 Series Routers
The Cisco 3825 and 3845 Routers have a default memory configuration of 128MB of removable Compact Flash and 512MB of synchronous dynamic RAM (SDRAM) memory.
The maximum memory supported on the Cisco 3800 Series is 512MB Compact Flash and 1GB of Synchronous dual in-line memory module (DIMM) DRAM.