I would expect you to have 4Gb - 512Gb of video RAM = 3.5Gb visible to Windows - so the question is where has the other half a gig gone?-Carol Haynes
My thinking exactly!
What other devices have you got that might use mapped memory? Check you device manager and check for memory mapped devices and see what has gobbled up you new memory!
Right - I'll check this out... AFAIK, there shouldn't be anything else using mapped memory. However, I am *guessing* that my ethernet cards, sound card (which is integrated), keyboard, touchpad, built-in webcam, may be contributing to this. I'll take a look when I get a chance (I'm on my XP machine at the moment).
From what I read (and its been a while so I may be wrong) enabling PAE in 32-bit XP doesn't actually do anything at all.
This is more or less my take on it as well. Once again - I've seen a lot of conflicting reports. The people I trust say it's a waste of time though (can't remember who those people are, off-hand).
Thanks for taking the time to answer, Carol, and everyone else.