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8 IBM ^ xSeries 440 Planning and Installation Guide
Figure 1-4 xSeries 440 system block diagram — one SMP Expansion Module
The component that contains the CPUs, processor/cache controller, memory
controller, memory, and cache is called the SMP Expansion Module (or central
electronics complex—CEC). The Xeon MP-based models of the x440 ship with
one SMP Expansion Module with two or four CPUs and 2 GB or 4 GB of RAM.
The Xeon DP-based models have either two CPUs in one SMP Expansion
Module or four CPUs in two SMP Expansion Modules.
Tip: The terms central electronics complex, CEC, and SMP Expansion
Module
are used interchangeably in relation to the x440. We use SMP
Expansion Module in this redbook.
Ultra160
SCSI
Gigabit
Ethernet
Video
USB
Kbd/Ms
RSA
33 MHz66 MHz
64-bit
66 MHz
64-bit
100 MHz
64-bit
133 MHz
Bus A66 MHz
RXE
Expansion
Port A
(1 GBps)
B-100
D-133C-133
IBM XA-32
core chipset
CEC 1
SMP Expansion
Ports (3.2GBps)
2 GBps
PCI bridge PCI bridge
SDRAM
3.2 GBps
32 MB
L4 cache
CPU 1 CPU 2 CPU 3 CPU 4
400 MHz
SDRAM
3.2 GBps
3.2 GBps
Processor &
cache controller
2 GBps
3.2 GBps
3.2
GBps
SDRAM
SDRAM
100MHz
4-way
interleave
Memory
controller