IBM 8687 Installation Guide - Page 32
SMP Expansion Module board, Path Diagnostics
UPC - 087944724261
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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 Locking levers SMP Expansion Module cover See-through hinged doors for DIMM access Connects to center plane this side DIMM sockets CPU 1 Handle CPU 3 XceL4 cache CPU 4 Figure 1-10 SMP Expansion Module VRM CPU 2 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 18 IBM ^ xSeries 440 Planning and Installation Guide