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18 IBM ^ xSeries 440 Planning and Installation Guide
Figure 1-10 SMP Expansion Module
Each SMP Expansion Module also contains 16 DIMM slots to take the memory
up to a maximum of 64 GB per node (using 2 GB DIMMs) and an additional 32
MB of Level 4 system cache for a maximum of 64 MB per node.
When two SMP Expansion Modules are installed, they are connected together
using two 3.2 GBps SMP Expansion Ports (also known as scalability ports).
Using two connections improves throughput beyond that of one connection and
provides load balancing. The third scalability port is not used in this single-node
eight-way configuration.
Each SMP Expansion Module is also equipped with the following LEDs for Light
Path Diagnostics:
Each DIMM
Each CPU
Each VRM
SMP Expansion Module board
Tip: Be careful when removing or installed the SMP Expansion Modules,
because you may damage the center plane. See tip H176162 for details:
http://www.pc.ibm.com/qtechinfo/MIGR-43675.html
DIMM sockets
CPU 4
CPU 2
CPU 3
CPU 1
VRM
XceL4 cache
Locking
levers
See-through hinged doors
for DIMM access
Handle
SMP Expansion
Module cover
Connects to
center plane
this side