Quote Originally Posted by 'wowphreak',index.php?page=Thread&postID=123413#po st123413
Just to nitpick a lil :P 32bit os can see up to 4 gigs to free up some of the memory when dont see all of it, go into yer bios and reduce the amount of memory that's dedicated to the graphics card. Vista 64 has the same issues but its not gonna matter since yeh can use more then 4 gigs.

One thing I advocate if yer gonna get vista get 64bit version and get at least 8 gigs of ram.
Hopefully you won't mind if I nitpick back a little?

While it's true that a 32-bit OS can see 4G, it can't use all 4G because there is a hole at the top of memory for MMIO. I'm not aware of any bios settings that let you reduce this (at least I know mine has none, which field are you talking about?), and even if there were, you'd be taking a big risk that somebody isn't going to assume that memory is mapped - many drivers do. In my experience, this memory is as good as lost.

Vista 64 does still allocate MMIO at the top of the 32-bit segment (only for driver compatibility reasons), but it does not have the same issue as vista 32 because the memory that is obscured can be remapped somewhere higher in the address range (beyond the 4G boundary). IOW, you will be able to use all 4G in a 4G system under vista 64.