4GB RAM is the hard limit for a 32-bit operating system. If you are running a 64-bit operating system, you can (as your computer will allow) install more than that and it is all accessible.

In Windows, when you launch a 32-bit app (such as BIAB), the O/S carves out up to a 4-GB virtual memory space for that app (depending upon how much you have and how much is already in use). If you launch another 32-bit app, it carves out up to another 4-GB virtual memory space. So a computer with 32-GB of RAM can theoretically run 8 32-bit apps with all of them having access to to a full 4-GB of RAM. Your processor then becomes the limiting factor, not how much RAM the program uses.

With just 4-GB on your computer, all the concurrently loaded apps effectively share that same 4-GB of space, just like they did in 32-bit Windows.


John

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