Underclock a CPU safely.?

I want to achieve it essentially the same effect as PDAs running XScales, I think I got the just of it on how it is done, undie the FSB. What is the safest values I could have gone: AMD Athlon X2 3800+ Socket 939 on an ECS RS480-M with 1 GB worth of DDR333. GPU too, All-in-Wonder X800 GT 128 MB DDR3, but that I... show more I want to achieve it essentially the same effect as PDAs running XScales, I think I got the just of it on how it is done, undie the FSB. What is the safest values I could have gone: AMD Athlon X2 3800+ Socket 939 on an ECS RS480-M with 1 GB worth of DDR333.

GPU too, All-in-Wonder X800 GT 128 MB DDR3, but that I have no idea how to go about it.
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