4G DRAM 1 DIMM F/ISR 4400 SPARECisco 4GB DDR2 SDRAM Memory Module For Router 4 GB (1 x 4GB) DDR2 SDRAM ECC 240 pin DIMM VPN: MEM 4400 4G= SKU: 416989NDN UPC: 882658561610 4 GB memory allows you to have more programs open at a time DIMM 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance 240 pin pin DDR2 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate