JSI Tip 4794. Comparing 32-Bit and 64-Bit Memory Architecture.

Microsoft Knowledge Base Article 294418 contains the following summary:

In the following table, the increased maximum resources of computers that are based on 64-bit versions of Windows and the 64-bit Intel processor are compared with existing 32-bit resource maximums.

Architectural component 64-bit Windows 32-bit Windows
Virtual memory 16 terabytes 4 GB
Paging file size 512 terabytes 16 terabytes
Hyperspace 8 GB 4 MB
Paged pool 128 GB 470 MB
Non-paged pool 128 GB 256 MB
System cache 1 terabyte 1 GB
System PTEs 128 GB 660 MB

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