The bus speed is set by the motherboard not the cpu.
Their is a hack to get the sawtooth to run with a 133Mhz bus.
Some people say it works, but other people say it just reports a 133Mhz bus but still runs at 100Mhz.
Mike
On 10/06/2004, at 8:26 PM, pdimage.fsnet.co.uk wrote:
Yes, BUT, it won't run at 533.
The DA cpu is expecting a 133mhz FSB, and has it's multiplier set to match. IE 133 x 4 = 533mhz
On a 100mhz FSB, that mult results in; 100 x 4 = 400mhz
Net result, no speedup, but it may run slightly cooler.
(And yeah, 133 x 4 = 532, but it's actually 133.33333333333.... )
Joshua Coombs
The maths sounds logical but the bus multiplier still seems
questionable to me - for instance what's the multiplier for the sawtooth
450mhz - 4.5? And how about the DA 466mhz - 3.5037x? And the QS 733mhz -
5.5112x? If that's the case the 533mhz should do 5.33 bus multiplier but
does it set itself or is there a way to reset it?
The old 40mhz and 50mhz bus 604/e mobos would take
120,150,180,200,233 and 250 processors plug/coda/pram and play fashion
and adjust accordingly even though the maths is iffy.
Perhaps worth mailing Apple...
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