Nope. It depends on youre operating system.

If you have the common Windows XP 32bit, you are maxed at 3,2GB. Anything more in your computer will be ignored.

You need Vista or WinXP 64bit to have more than that supported.

Of course you also need the slots on your motherboard to stuff the RAM, but that usually never is the problem... ;)

And for the topic: I absolutely love it, now EB plays almost fluently! Such optimizations may seems simple, but I'm aware that exactly those often are very tricky and require a lot of cleverness and the right idea to improve such processes, many thanks for the efforts!