Why does Red Hat Enterprise Linux 5 32bit PAE detects only 64Gib of memory?

Solution Unverified - Updated -

Issue

  • RHEL 5.6 32bit installation on a new Dell R710 with 128GB of RAM is only showing 64GB of RAM.
  • Why RHEL 5 PAE kernel detects upto 64 Gib of memory ?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • 32bit x86
  • PAE Kernel

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