It may or may not be a problem
for your specific situation, but more than 4 GB of RAM on 32 bit hardware is not an ideal situation.
Normally 32 bit hardware and software is limited to 4 GB of RAM, as that is the maximum size of the address space. To work around this (until 64 bit hardware becomes dominant), a technique called Physical Address Extension
To put it very simply, PAE breaks your total RAM up into virtual memory areas that are no larger than 4 GB each. Individual processes have access to these virtual memory banks through pages. In other words, no 32 bit application ever sees more than 4 GB of RAM at the same time.
This means that on a machine with 16 GB of RAM, you could have 4 processes each taking up 4 GB. But one process couldn't use the whole 16, or even be aware it was there.