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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