Cisco 1900 Series Router memory

MEM-1900-512MB-DEF (Approved)
MEM-1900-512MB-DEF (Third Party)
512MB DRAM for Cisco 1941 ISR (Default)

MEM-1900-512U1GB (Approved)
MEM-1900-512U1GB (Third Party)
512MB to 1GB DRAM Upgrade (512MB+512MB) for Cisco 1941 ISR

MEM-1900-512U1.5GB (Approved)
MEM-1900-512U1.5GB (Third Party)
512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 1941 ISR

MEM-1900-512U2.5GB (Approved)
MEM-1900-512U2.5GB (Third Party)
512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 1941 ISR

MEM-1900-512MB= (Approved)
MEM-1900-512MB= (Third Party)
512MB DRAM for Cisco 1941/1941W ISR (only as spare)

MEM-1900-1GB= (Approved)
MEM-1900-1GB= (Third Party)
1GB DRAM for Cisco 1941/1941W ISR (only as spare)

MEM-1900-2GB= (Approved)
MEM-1900-2GB= (Third Party)
2GB DRAM for Cisco 1941/1941W ISR (only as spare)