>so the guys you bought it from might be perfectly honest, and the chip
>probably DOES do 250Mhz, but only on a 50 Mhz bus. the problem might be
>your bus speed. it can't be upgraded and you can't get any more
>acceleration out of it.
>
>8 times the bus speed is all you can get, regardless of what the chip
>can reach.
>
>janet
I don't think so - XLR8 sell a G4/500 (10x) for the pci macs with a
50mhz bus and Sonnet sell a G4/800 (16x)for the pci Macs.
The bus speed can certainly vary lower or higher - Umax S900 owners
have reported bus speeds higher than 50mhz with a little tweaking and the
bus multipliers do not have to be whole numbers - they can adjust to the
speed of the processor - so a 40mhz bus will run a 180mhz card at 4.5
multiple - similar with 66mhz bus and 233/266/300/350 processors.
So a 225mhz Umax on a 50mhz bus should run at 4.5 multiplier. I
think the daughtercard processors adjust automatically with a cuda before
booting.
Pete
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