My old StrongARM motherboard has the CPU soldered in place. Most current SoCs don't have a PCI bus so there isn't very much you would be able to add on. A manu

My old StrongARM motherboard has the CPU soldered in place. Most current SoCs don't have a PCI bus so there isn't very much you would be able to add on. A manufacturer could provide one or two SODIMM sockets instead of soldering DRAM onto the board though.