MEMG= 2G DRAM (1 DIMM) for Cisco ISR 4400, CP or Data Plane, Spare MEMGU16G 4G to 16G DRAM Upgrade (8G+8G) for Cisco ISR 4400 MEMGU8G 4G to 8G DRAM Upgrade (4G+4G) for Cisco ISR 4400 MEM-4400-DP-2G= 2G DRAM (1 DIMM) for ISR4400 DataPlane. Same as MEMG= MEMG= 4G DRAM (1 DIMM) for Cisco ISR 4400, Spare MEM-4400-DP-2G 2G DRAM (1 DIMM) for Cisco ISR 4400 Data Plane MEMG= 8G DRAM (1 DIMM) for Cisco ISR 4400, Spare MEMG 4G DRAM (2G+2G) for Cisco ISR 4400