From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek <konrad@virtualiron.com>
Subject: Re: Hypervisor Memory Limitations on 64-bit Architecture?
Date: Mon, 21 Jul 2008 09:17:22 -0400
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> http://www.redhat.com/rhel/compare/
> 
> RHEL5 supports 16 GB of mem on x86 (32bit) platform. 
> RHEL5 supports 256 GB of mem on x86_64 platform.

Actually in RHEL5 U2 it can do 512GB on x86_64 platforms. Check this out:

http://lists.xensource.com/archives/html/xen-devel/2007-11/msg00616.html
(The bug-fix for this isn't mentioned in the release notes - not sure why
thought)