On 14/6/02 9:48 pm, "Robert Hutchins" <[EMAIL PROTECTED]> wrote:

> Questions:
> 
> Does a PCI processor upgrade (ie. a sonnet G3 into an 8500) increase the bus
> speed?

It may or may not. With some accelerator cards you can increase the bus
speed a little above the max of 50 mHz, but you could easily end up with an
unstable machine. I was unlucky in fitting an old style XLR8 G3/300 (the one
with green rotary switches) in my 7600, and can only achieve a 43 mHz bus,
when with the previous 604e 200 mHz module it ran at 50 mHz.

> 
> Is it then slowed down by "slow" memory on the motherboard?

I would think if the memory access speed was too slow you would get errors
or freezes, not slower operation. I have interleaved my memory for more
speed, but I gather some cards don't like this and you specifically have to
de interleave. My memory is mainly 60 ns, with some 70 ns. Again, I have
heard some cards behave better with all 60 ns memory, but I have no
problems. This is one of the most stable Macs I've ever used.

> I was under the impression that a G4 only benifits specific software that
> calls G4 > routines. Is this true?

A G4 will run apps faster than a G3, and faster still if it specifically
utilises the G4 as Photoshop does.


> Is IDE inherently slower than SCSI?
> What about ATA?

The fastest SCSI is faster than IDE, but also most modern IDE drives are
faster than 5 year old SCSI drives fitted to most powermacs. IDE uses the
processor more, so isn't ideal for multitasking.

Steve Bell


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