"640K ought to be enough for anybody." Bill Gates, 1981. "64 bit is coming to desktops,there is no doubt about that, But apart from Photoshop, I can't think of desktop applications where you would need more than 4 gigabytes of physical memory, which is what you have to have in order to benefit from this technology." It seems to me that by the time it ships, Longhorn will need 4 gigs of RAM.
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Considering that AMD's entire processor line will soon be 64-bit following the release of the Athlon 64, there's no real reason not to support 64-bits on the desktop as users will be getting 64-bit support "for free". A 64-bit kernel will have significantly better performance in many areas, most notably NTFS performance as 64-bit filesystem operations won't have to be "emulated" using 32-bit integers. Having 64-bits of address space to work with eases load upon the VMM, and allows large files to be memory mapped without worry.
Considering that AMD's entire processor line will soon be 64-bit following the release of the Athlon 64, there's no real reason not to support 64-bits on the desktop as users will be getting 64-bit support "for free". A 64-bit kernel will have significantly better performance in many areas, most notably NTFS performance as 64-bit filesystem operations won't have to be "emulated" using 32-bit integers. Having 64-bits of address space to work with eases load upon the VMM, and allows large files to be memory mapped without worry.