Dual Boot windows 32bit and 64bit overclocking problems

Im pretty new to overclocking and this is my first try I manage to get my AMD Venice 3200 to hit 2500 with 250fsb X 10, HTT 4, vcore 1.44. I used memory divider 166/200 so the memory is running at 208MHz not alot of overclocking on the memory since it is some cheap brand.
My problem is that I have dual boot and with windows xp everything is fine CPU-z reports the right speed for the cpu and memory when I overclock, and there is an increse in preformance with overclocking, But when I boot windows XP 64bit CPU-z reports the FSB as 200 so it is not showing any change, it does report the change in the memory divider 166/200 and the cpu voltage increased that I applied to overclock. The thing is that when I open systerm properties it shows the CPU speed as 2500MHz but when I test the preformance there isnt any increase. I used Superpi to test preformance and in windows XP 32bit it finishes the 1M test in 36seconds while in Windows XP 64bit it takes 42seconds.
My system specs are
AMD Venice 3200
MSI K8N Platium bios 1.8
1024MB Wintec Memory 3200
Geforce 6800 GTO 400/1100
OCZ ModStream OCZ52012U 520W Power Supply

  Im runing the final release of Windows xp 64 and cpu-z 1.30, I also have Everest Ultimate Edition and it only shows 3% overclock 205 FSB.  Im thinking of formating the HD with windows 64 and installing it again with the systerm already overclock.

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