ExtremeTech takes a look at 64-Bit Windows performance on Dual-Core CPU's

Windows XP Pro x64 has been out for several months now. How does its performance compare with 32-bit Windows when both are running on the same model dual-core CPU? We dropped in a dual-core Athlon 64, and installed a boatload of benchmarks apps to find out.

64-Bit Windows' Performance on Dual-Core