Keystron MEM-4400-8G= (1x8GB) 8GB Upgrade Module for Cisco ISR 4400 Series — Fits 4431 & 4451

8GB memory module MEM-4400-8G= by Keystron, made for Cisco ISR 4400 series routers including models 4431 and 4451. These ISR 4400 platforms employ memory interleaving, so both DIMM slots must be populated with modules of the same capacity to achieve correct operation and optimal performance.