Not all memory is shown in the BIOS is usable to the operating system.

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Issue

The dmidecode command shows a larger amount of RAM modules in the machine than memory available.
Less memory is showing as usable compared to the amount of RAM in the system.

Environment

Red Hat Enterprise Linux 5 - All architectures
Red Hat Enterprise Linux 6 - All architectures
HP ProLiant DL380p Gen8 system.

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