Just had a look around.
The (dead) Asus A7N266 MoBo I have lying around has exactly two Xtals
one with
14.033MHz ( looks like they derive all other System clocks from this
one)
and the other with
32.768 KHz ( linked to the RTC )
I don't think that this is any different for other recent MoBos
Single xtal boards should be possible too, though you loose
some ability for fault detection that way.
uwe
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