Windows XP Professional x64 Edition gives you faster performance, more reliability, and greater flexibility than 32-bit systems. You can run memory-intensive and calculation-intensive applications and processes more efficiently. Whether you’re a technical workstation user or a cutting-edge home PC enthusiast, it provides a secure platform that can run new 64-bit applications, as well as most existing 32-bit applications, on a single PC—while still having all of the benefits of Windows XP Professional Edition.

Premier performance
Windows XP Professional x64 Edition is a robust platform that offers premier performance that is unparalleled in the mainstream 32-bit desktop environment. Sixty-four-bit native applications can deliver more data more quickly, so memory-intensive applications can run more quickly and efficiently. Data in memory is accessed thousands of times faster than it is on a disk drive. Applications can preload substantially more data into virtual memory, allowing rapid access by the 64-bit processor.

Greater flexibility
Windows XP Professional x64 Edition gives you a robust platform for the integration of 64-bit and 32-bit applications using the Windows on Windows 64 (WOW64) x86 emulation layer. You can move to 64-bit computing while still maintaining your existing investment in 32-bit software and Windows expertise.

Vast memory support
The key difference between 32-bit and 64-bit computing with Windows XP is that the 64-bit version can use more system memory. Windows XP Professional x64 Edition supports up to 128 gigabytes (GB) of RAM and 16 terabytes of virtual memory, so applications can run faster when working with large data sets. Physical memory support will grow in the future as hardware capabilities expand.64-bit vs. 32-bit architecture.