Advanced Micro Devices Inc (AMD)

[dacaw]

And from the StarNet article note this interesting bit:

"X-Win64 offers a significant boost in performance when connecting to high-end CAD, EDA and other graphics software running on powerful UNIX and LINUX servers. Benchmark tests showed a dramatic performance boost of 3-D applications with X-Win64 versus the same applications running on a 32-bit Windows system with X-Win32. The "Particle" OpenGL test application, for example, achieved a 129 frames-per-second (fps) rate on a 1.4GHz dual Opteron system running Windows XP/64. The same application recorded a 45 fps rate on a 2GHz Windows XP system."

Though the systems are different they seem to be saying that XP64 offers a speed increase over XP32.