You will love this.
From PCStats: "PCStats thought it would be interesting to see how overclocking is affected on the WindowsXP x64 Edition platform by illustrating both 32-bit and 64-bit benchmarks for an AMD Athlon64 4000+ based system. Would the test platform be stable enough to overclock successfully? Would WindowsXP x64 Edition require a more stable processor than its 32-bit counterpart does?"