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Anyway, what does 64-bit buy you on the Windows side?


It gets you increased address space.

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(I assume there's some sort of paging algorithm being used)


There is -- Windows has two different things going on in this area: one is PAE, which allows the OS to use more than 4Gb of RAM. When switching between apps, it'll map the 36-bits (on Intel, 37-bits on AMD) worth of RAM into the 32-bit address space.

An individual application can use AWE, which allows it to page areas of 36-bit-space into 32-bit-space.

However, it ain't transparent, and smacks a bit of the bad old days of Expanded Memory (EMM) on DOS.
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-- roger