Sent from my iPhone
On 4 May 2010, at 06:14, John Carmonne <[email protected]> wrote:
Hi All
Recently I got a 400MHz processor from a Lombard and put it in my
Wally 233. I showed 400MHz in the profilier in OS 9.2.2 but only
233 MHz or a higher speed but not 400MHz in OS 10.4.11.
Right, there could be a number of reasons for this, not least the fact
that the Lombard and Wallstreet are not generally thought to be
processor compatible.
1) Classic Mac OS was reading the processor speed by identifying the
processor specification.
2) Mac OS X was unable to identify the processor had changed speed,
and reported the speed the bus calculated the processor was running at.
Things to note: processors will only run at the physical speed the bus
will support and the speed is determined via a number of factors - the
amount of power the processor is getting, the clock crystal that
regulates the speed of the bus and probably a bunch of parameters in
the realms of the handshake between the processor daughter card and
the main logic board.
My theory : the max speed your Wallstreet will run at without a
specialist processor upgrade that is designed to fool the system is
what Mac OS X reported. The Classic Mac OS simply reported the
processor speed according to the card. The card was actually being
underclocked to the slower speed.
You are lucky it worked. It might have fried your machine. It probably
wouldn't be a good idea to run it for extended periods, although if it
was stable, running an underclocked processor would have certain
advantages with reduction in thermal output.
M
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