Cisco 2900 Series Router memory

MEM-2951-512MB-DEF (Approved)
MEM-2951-512MB-DEF (Third Party)
512MB DRAM (1 512MB DIMM) for Cisco 2951 ISR (Default)

MEM-2951-512U1GB (Approved)
MEM-2951-512U1GB (Third Party)
512MB to 1GB DRAM Upgrade (1 1GB DIMM) for Cisco 2951 ISR

MEM-2951-512U1.5GB (Approved)
MEM-2951-512U1.5GB (Third Party)
512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 2951 ISR

MEM-2951-512U2GB (Approved)
MEM-2951-512U2GB (Third Party)
512MB to 2GB DRAM Upgrade (1 2GB DIMM) for Cisco 2951 ISR

MEM-2900-512MB-DEF (Approved)
MEM-2900-512MB-DEF (Third Party)
512MB DRAM for Cisco 2901-2921 ISR (Default)

MEM-2900-512U1GB (Approved)
MEM-2900-512U1GB (Third Party)
512MB to 1GB DRAM Upgrade (512MB+512MB) for Cisco 2901-2921

MEM-2900-512U1.5GB (Approved)
MEM-2900-512U1.5GB (Third Party)
512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 2901-2921

MEM-2900-512U2.5GB (Approved)
MEM-2900-512U2.5GB (Third Party)
512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 2901-2921

MEM-2951-512MB= (Approved)
MEM-2951-512MB= (Third Party)
512MB DRAM for Cisco 2951 ISR (only as spare)

MEM-2951-1GB= (Approved)
MEM-2951-1GB= (Third Party)
1GB DRAM for Cisco 2951 ISR (only as spare)

MEM-2951-2GB= (Approved)
MEM-2951-2GB= (Third Party)
2GB DRAM for Cisco 2951 ISR (only as spare)

MEM-2900-512MB= (Approved)
MEM-2900-512MB= (Third Party)
512MB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare)

MEM-2900-1GB= (Approved)
MEM-2900-1GB= (Third Party)
1 GB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare)

MEM-2900-2GB= (Approved)
MEM-2900-2GB= (Third Party)
2GB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare)