128-MB upgrade: MEM3640-4X32D= (4 x 32 MB DRAM SIMMs)For the 3640:

MEM3640-4X32D DRAM SIMMs configuration for Cisco 3640 Routers

Cisco 3640 routers each contain four SIMM sockets for DRAM: bank 0 (SIMM 0), bank 1 (SIMM 1), bank 2 (SIMM 2), and bank 3 (SIMM 3). A socket corresponds to one bank of memory. Each socket can hold one MEM3640-4X32D DRAM SIMM of any size permitted for that router.

Banks must be filled consecutively with no gaps. Start filling from bank 0, and start emptying from bank 3. Bank 0 must always be filled first and emptied last.
 
DRAM supports 32-bit and 64-bit operation as follows:
Cisco 3640: Supports either 32- MEM3640-4X32D or 64-bit operation. Router performance is approximately 20 percent slower in 32-bit mode than in 64-bit mode. To use 64-bit mode, you must install DRAM SIMMs in pairs of the same size. Generally, basic software feature sets (such as IP) use 32-bit DRAM SIMMs and robust software feature sets (such as Enterprise) use 64-bit DRAM SIMMs.

RICOM sells new and refurbished Cisco 3640 memory upgrades MEM36404X32D

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