I have installed Red Hat Enterprise Linux (v.3) for i386 on my Opteron based system and the kernel does not recognize more than 4GB of RAM. How do I resolve this?

Red Hat Enterprise Linux (v.3) for i386 will treat Opteron systems as AMD Athlon systems. The Athlon kernels do not have PAE enabled due to compatibility issues with older Athlon based systems. You may do one of the following to get your system to recognize all of the installed memory.

1. Reinstall the system using the x86_64 port of Red Hat Enterprise Linux (v.3)

2. ...