This page contains suggested memory options for various motherboards. It may help decide on the best memory form-factor for a motherboard

ATCA Memory
                 VLP and ULP RDIMMs

AMC Memory
                 SODIMMs

cPCI Memory
                 SODIMMs (for 1 slot 3U/6U), RDIMMs (for 2 slot 6U)

PC104 Memory
                 SODIMMs