... of the two memory slots on the router. Memory upgrades on the Cisco 2951 can involve an increase in the ... SKUDescriptionMEM-CF-256U4GB256MB to 4GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISRMEM-CF-256U2GB256MB to 2GB ... are provide the New Original Cisco switches, Cisco Router, Cisco Firewall, Cisco SFP (Mini GBIC) Transceiver, Cisco Wireless Access Point, Cisco Wireless Control...etc. Please ...