The main differences between the 32-bit versions of Windows 7 and the 64-bit versions of Windows 7
| Architecture | Windows 7, 32-bit versions | Windows 7, 64-bit versions |
|---|---|---|
| System requirements | 1-gigahertz (GHz) 32-bit (x86) processor or 64-bit (x64) processor, 512 MB of RAM | 1-GHz 64-bit (x64) processor, 1 GB of RAM (4 GB recommended) |
| Memory access | A 32-bit version of Windows 7 can access up to 4 GB of RAM. | A 64-bit version of Windows 7 can access from 1 GB of RAM to more than 128 GB of RAM. |
| Memory access per edition | All 32-bit versions of Windows 7 can access up to 4 GB of RAM. | Windows 7 Home Basic - 8 GB of RAM Windows 7 Home Premium - 16 GB of RAM Windows 7 Ultimate - 128 GB of RAM or more |
| DEP | 32-bit versions of Windows 7 use a software-based version of DEP. | 64-bit versions of Windows 7 support hardware-backed DEP. |
| Kernel Patch Protection (PatchGuard) | This feature is not available in 32-bit versions of Windows 7 | This feature is available in 64-bit versions of Windows 7. Kernel Patch Protection helps prevent a malicious program from updating the Windows 7 kernel. This feature works by helping to prevent a kernel-mode driver from extending or replacing other kernel services. Also, this feature helps prevent third-party programs from updating (patching) any part of the kernel. |
| Driver signing | Unsigned drivers may be used with 32-bit versions of Windows 7. | 64-bit versions of Windows 7 require that all device drivers be digitally signed by the developer. |
| 32-bit driver support | 32-bit versions of Windows 7 support 32-bit drivers that are designed for Windows Vista. | 64-bit versions of Windows 7 do not support 32-bit device drivers. |
| 16-bit program support | 32-bit versions of Windows 7 support 16-bit programs, in part. | 64-bit versions of Windows 7 do not support 16-bit programs. |
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