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##### CPU Module Population Rules

The Sun Fire X4640 has eight CPU module slots (see CPU Module Slot Designations) and two possible CPU module configurations: 8 modules and 4 modules. No other configurations are supported. The configurations require a specific population sequence. The CPU module naming system (for example, CPU 0, CPU 1, CPU 2) is dependent upon the configuration. CPU module filler cards are required for the four module configuration.

For each configuration populate these slots1
Configuration | H | G | F | E | D | C | B | A
--- | --- | --- | --- | --- | --- | --- | --- | ---
8 modules | CPU 7 | CPU 6 | CPU 5 | CPU 4 | CPU 3 | CPU 2 | CPU 1 | CPU 0
4 modules | CPU 3 | filler card | filler card | CPU 2 | CPU 1 | filler card | filler card | CPU 0

1 CPU module names change depending on the configuration.

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