...between thse two CPUs:

AMD ThunderBird 1.4GHz AYHJA CPU Guaranteed to 1533MHz+

and

AMD Athlon Thunderbird 1.4GHz "AYHJA" 266MHz FSB (Socket A)

the first one apparently costs a bit more. is it cos it's overclockable to 1.533ghz and the other isn't? i would have thought both could be overclocked to that speed.