The PTP motherboards are usually capable of running up to 60MHz,
sometimes faster; all of them should be able to run at least 50MHz.
Some of the older 604 CPU cards used lower bus speeds for various
reasons, mostly techy bits involving the CPU multipliers and such.
Are you sure the PTP bus can be pushed that high? What's the highest
stable bus setting you've personally achieved with a PTP? I think
you may have the PCP (PowerCenter Pro) in mind when you mention "up
to 60MHz, sometimes faster"....
AFAIK, the PCP is the *ONLY* pre-G3 Power Mac that can be counted on
to run 60 MHz+ bus speeds. My main Mac at the moment is a PCP w/XLR8
MACh Carrier, currently running an OEM B&W 350 ZIF @420 MHz (64.6 bus
x 6.5). This PCP mobo has tolerated bus settings as high as 68.8!
It may even go higher, but I haven't messed around in search of
undocumented settings lately.
Pax,
--
Gene, a.k.a. G-Man
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