[rhelv6-list] RHEL6 x86 on system with 4 GB memory

[Jonathan M. Polom]

I have Red Hat 6 x86 installed on a Pentium 4 system with 4 GB system
memory. Although the default kernel has PAE capability (no modules in
lsmod but it's a requirement for the x86 variant so it's likely
compiled in) it claims total system memory is about 3.3GB (via top or
gnome performance monitor). How do you get RHEL6 to see >= 4GB memory?
Is it a kernel argument or something else?

Thanks for any help.

-- 
Jon Polom