Cisco MEM3800-256D 256MB DIMM DDR DRAM for 3800 Router
Router Memory Upgrade - YouTube
CMS 512MB (1X512MB) DDR1 2100 266MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with Cisco® 2811 Router Main Memory DMemory Ram Upgrade2811-512D for Server Only - C89 at Amazon.com
Four Main Memory Areas in a Cisco Router – Router Switch Blog
MEM2851-256U768D 512MB DRAM Memory for Cisco Router 2851 (PARTS-QUICK Brand) at Amazon.com
Cisco 2921/2911/2901 Series MEM-2900-2GB= DRAM Memory Options
128mb DRAM Memory for Cisco 1811 & 1812 Routers (Cisco PN# MEM181X-128U256D) at Amazon.com
CMS 512MB (1X512MB) DDR1 2100 266MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with Cisco® 2811 Router Main Memory DMemory Ram Upgrade2811-512D for Server Only - C89 at Amazon.com