Features:
2GB dual in-line memory module (DIMM) DRAM for Cisco 2901, 2911, 2921 ISR
All the Cisco 2900 Series base platforms ship with a default memory of 512MB DRAM and 256MB Compact Flash. The default DRAM of 512MB is soldered onto the motherboard for the Cisco 2921, 2911, and 2901 routers.
Any memory upgrades will populate the remaining memory slot in densities of 512MB, 1GB, and 2GB. DRAM part numbers are shared across the Cisco 2921, 2911, and 2901 but not the Cisco 2951.