NEC HX4500 User Manual page 28

The CPU base board plugs into the underside of the system I/O board and the
memory board plugs into the CPU base board. Figure 1-5 shows the system with
the left side cover removed.
A
B
C
D
E
Figure 1-5. CPU Base Board and CPU Board Location
1-12 System Overview
A CPU base board
B Memory board
C Rear CPU fan
D Rear CPU fan
E Voltage Regulator Module socket
(VRM1 - VRM6)
F Front CPU fan (2)
G Pentium II Xeon processors (1 - 4)
H Voltage Module Socket (memory)
H
F
G