Physical Memory Limits: Windows XP
The following table specifies the limits on physical memory for Windows XP.
| Version | Limit in 32-bit Windows | Limit in 64-bit Windows |
|---|
| Windows XP | 4 GB | 128 GB |
| Windows XP Starter Edition | 512 MB | Not applicable |
Microsoft Windows XP Professional x64 Edition released on April 25, 2005 byMicrosoft is a variation of theWindows XP operating system for x86-64 personal computers.
Windows XP Professional x64 Edition uses version 5.2.3790.1830 of core files, the same version used byWindows XP 64-bit Edition 2003 and Windows Server 2003 SP1 as they were the latest versions during the operating system's development. It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture.
The primary benefit of moving to 64-bit is the increase in the maximum allocatable systemmemory (RAM). Windows XP 32-bit is limited to a total of 4GB, which is, by default, equally divided betweenWindows kernel and application usage. Using the /3GB switch in the boot.ini file forces Windows to limit the kernel to the upper 1GB and provides up to 3GB for applications. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exbibytes (16 billion Gibabytes), Windows XP x64 is currently limited to 128 GB of physical memory and 16TiB ofvirtual memory. Microsoft claims this limit will be increased as hardware capabilities improve
Microsoft Windows XP Professional x64 Edition released on April 25, 2005 byMicrosoft is a variation of theWindows XP operating system for x86-64 personal computers.
Windows XP Professional x64 Edition uses version 5.2.3790.1830 of core files, the same version used byWindows XP 64-bit Edition 2003 and Windows Server 2003 SP1 as they were the latest versions during the operating system's development. It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture.
The primary benefit of moving to 64-bit is the increase in the maximum allocatable systemmemory (RAM). Windows XP 32-bit is limited to a total of 4GB, which is, by default, equally divided betweenWindows kernel and application usage. Using the /3GB switch in the boot.ini file forces Windows to limit the kernel to the upper 1GB and provides up to 3GB for applications. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exbibytes (16 billion Gibabytes), Windows XP x64 is currently limited to 128 GB of physical memory and 16TiB ofvirtual memory. Microsoft claims this limit will be increased as hardware capabilities improve