XP 32-bit edition supports a total of 4 GB of memory: physical ram + pagefile (XP sees pagefile as memory)Keebler Elf said:I also was told that Windows XP does not support more than 3GB of RAM so anymore than that is a waste. I asked about Vista and got a long answer that I didn't understand; in short, yeah you can go above 3GB but there are other limitations (I think it's a different sort of RAM).
XP 64-bit edition supports a total of 128 GB of memory, but try finding a consumer motherboard that supports that much memory!
I believe Vista is the same.