IBM Power Systems 775 Manual page 38

Figure 1-12 POWER7 quad chip module
1.4.10 Octant
This section discusses the "octant" level of the system.
Figure 1-13 on page 25 shows a 32-way SMP with two-tier SMP fabric, four chip processor
MCM + Hub SCM with onboard optics.
Each octant represents 1/8 of the CEC planar, which contains one QCM, one Hub module,
and up to 16 associated memory modules.
Octant 0: Octant 0 controls another PCIe 8x slot that is used for an Ethernet adapter for
cluster management.
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IBM Power Systems 775 for AIX and Linux HPC Solution
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