The entire VRAM address space is not mapped by the CPU, instead part of the 2GB virtual address space is mapped (up to a limit of 256MB) plus in XP (but not in a patched up Vista) the dynamic PCI-E aperture (or fixed 64mb, 128mb or 256mb aperture on AGP).
The limit is 4GB in total, this includes RAM and certain parts of the page file.
I thought a 32bit OS couldn't address / utilise > 4gb so isn't 8gb in a 32bit system overkill and quite possibly useless ?
It is a cosmetic limitation in client editions of Windows.
It's not simply cosmetic, and even some server editions only support 4GB of memory. It's a compatibility limitation.
Only on my netbook. You'd be mental to not use 64bit wherever you can now.
You can dual boot a 32bit and 64bit version of the same OS. You could even have two hot-swap boot drives if you want to go that way instead.
Sounds pretty ignorant mate. Some people don't feel like spending a buncha monies on a new OS when 32bit isn't exactly limited. There's no reason to not use 64bit but for the average user there's little reason to bother either.
What does the latter part of that exactly mean?
I thought a 32bit OS couldn't address / utilise > 4gb so isn't 8gb in a 32bit system overkill and quite possibly useless ?