Originally Posted by Quakeboy02
If that means that it has more than 4GB of RAM installed, then you will need a PAE enabled kernel to make use of it by the kernel.
Even if you have just 4GB of RAM, you need a PAE enabled kernel to make use of all of it. The max ram without a PAE kernel depends on some details of your BIOS. It is often 3.25GB, rarely less, sometimes more, but never very near a full 4GB.
If you have more than 8GB of RAM with a 32 bit PAE kernel, you are likely to run into problems caused by the normal 1GB limit on kernel virtual memory. I don't know the details of the work arounds if you really need them. Most people with more than 8GB of RAM should choose a 64 bit kernel and avoid those issues. Tell us if you have more than 8GB and have a good reason to use a 32bit kernel. Maybe someone who knows those details would explain.
I think some Red Hat versions also have license restrictions on the amount of RAM, so they may give you access to less than the total your system physically has. I don't know those details either.
Other than the above, there should be no problems. The 32 bit kernel will not care that the CPU could have run 64 bit. Any x86_64 CPU can operate as a totally functional, compatible and efficient 32 bit x86 CPU. Once you are running a 32 bit kernel all installation and operation of other programs will act just as it would have on a 32 bit CPU.
Even if you have too much ram for a non PAE kernel and/or too much for some Red Hat restriction, that won't stop the system from working. It would just give you use of less than all of your ram.