NEC Server 140Rc-4 - Manual (Page 46)

2-12 General Description
Processor Board
1 CPU1 socket (the default processor is installed in this socket)
2 CPU2 socket (the optional processor should be installed in this socket)
3 CPU3 socket (the optional processor should be installed in this socket)
4 CPU4 socket (the optional processor should be installed in this socket)
5 Baseboard interface connectors
6 Memory board interface connector
3 4
2
5 1 6 5