Is it necessary to install ProLiant Support pack on HP ProLiant systems ?

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Issue

This is a HP ProLiant system, do we need to install (ProLiant Support pack) 'psp-9.00.rhel5.x86_64' ?
If we don't, any impact on the other part of OS or application ?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
HP ProLiant Support Pack

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