Cannot see extra Memory

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http://www.unix.com – Hi, I upgraded the physical memory on my RHEL5 server (BL460cG7) from 32G to 128G. When I rebooted the box I can see from the "hpasmcli" that the 128G memory has installed correctly. However when I run a "free" command I can only see 64G of physical RAM? Is there a restriction on the max amount of memory a RHEL5 32-bit server can use? If not is there a parameter that needs updating in order for the extra memory to be seen by the OS? R, D. (HowTos)