The router may be converted to 64bit operation by installing memory
in pairs under the 32-bit configuration the slots should be 4 (4 Banks of 1). Modules may be 16MB or 8MB. To upgrade the main memory (64-bit), please see 3640 (main memory) (64-bit)section. To upgrade the flash simm memory, please see 3640 (flash simm memory) section. To upgrade the removable flash memory, please see 3640 (removable flash memory) section.