Thursday, September 30, 2010


The main differences between the 32-bit versions of Windows  and the 64-bit versions of Windows  relate to memory accessibility, memory management, and enhanced security features. The security features that are available in the 64-bit versions of Windows  include the following:
  • Kernel Patch Protection
  • Support for hardware-backed Data Execution Protection (DEP)
  • Mandatory driver signing
  • Removal of support for 32-bit drivers
  • Removal of the 16-bit subsystem
One of the greatest advantages of using a 64-bit version of Windows  is the ability to access physical memory (RAM) that is above the 4-gigabyte (GB) range. This physical memory is not addressable by 32-bit versions . 

Depending on the version of Windows  that is installed, a 64-bit version of Windows  supports from 1 GB of RAM to more than 128 GB of RAM. The ability to address more physical memory lets Windows  minimize the time that is required to swap processes in and out of physical memory. Therefore, Windows  can manage processes more efficiently. This memory management feature helps improve the overall performance of Windows .

Advantages when you install a 64-bit version of Windows 

  • Increased memory support beyond that of the 4-GB addressable memory space that is available in a 32-bit operating system
  • Increased program performance for programs that are written to take advantage of a 64-bit operating system
  • Enhanced security features

What to consider when you install a 64-bit version of Windows 

  • 64-bit device drivers may not be available for one or more devices in the computer.
  • Device drivers must be digitally signed.
  • 32-bit device drivers are not supported.
  • 32-bit programs may not be fully compatible with a 64-bit operating system.
  • It may be difficult to locate programs that are written specifically for a 64-bit operating system.
  • Not all hardware devices may be compatible with a 64-bit version of Windows .

I hope that answers your questions Nikhil. 


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