MEM-A-RSP720-2G
RSP720 1G to 2G RP Memory Upgrade (2 x 1G Modules, SO-DIMM)
sku: SKU29791 MEM-A-RSP720-4G
RSP720 RP Memory Upgrade to 4G (2 x 2G Modules, SO-DIMM)
sku: SKU29801 MEM-C6K-WAN-128M
FlexWAN Module Memory for Cisco 7600/Cat 6500, 128MB
sku: SKU29901