NEC A1160 - Manual (Page 20)

Processors
2-2
Figure 2-1 Basic Cell
Processors
Within each cell, the processor board in the main logic module hosts the processors.
The processor board contains the processor sockets, processor voltage regulator
modules, node controller, and the scalability ports, which are the ports that enable you to
connect up to four cells.
Processor Sockets
Each cell contains four processor sockets. Four direct front-side buses provide the
connections for the four processor sockets. Each direct front-side bus operates at 1067
MT/s.