Check uname again, is it actually using the PAE kernel? It may have rebooted into the regular one again (if so, update your grub config and reboot again). Once it's booted with the PAE kernel you can remove the old one.
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Theoretically, a 32-bit system should be able to address up to 4GB RAM with a non-PAE kernel; practically, the PAE kernel is required for systems with more than ~2.5GB RAM. Check "/etc/grub.conf" to see which kernel's booted by default. If the PAE kernel is in-use, check your RAM. Also, 'DEFAULTKERNEL' within "/etc/sysconfig/kernel" should be set to "kernel-PAE" rather than "kernel".
Last edited by GGWH-James; 05-26-2011 at 11:00 AM.