On Mar 2, 6:40 am, Bucky <[email protected]> wrote:
> On Mar 2, 7:01 am, K K <[email protected]> wrote:
>
>
>
> > TOPIC: Pismo CPU type
> > numbers?http://groups.google.com/group/g-books/t/bdca0501e6d6c990?hl=en
>
> > Hi- to clarify please-
> > I asked about the Pismo Processor of 500 mhz and a CPU type of: PowerPC 750
> > (83.0) and another with PowerPC 750 (42.2).
> > Thanks to PeterH for the reply. (I have edited it to the G3 content as I am
> > trying to understand), based on this information, which processor card do I
> > want then, the one with 83.0 or the one with 42.2 in the CPU parentheses?
> > Thanks.
>
> > == 2 of 2 ==
> > Date: Sun, Mar 1 2009 7:25 am
> > From: PeterH
>
> > Early G3s, particularly the slower ones, were fabricated using aluminum as
> > the internal conductors. Later G3s, particularly the faster ones, were
> > fabricated using copper as the internal conductors. As these are CMOS
> > processors, the lower resistance of copper facilitated making faster
> > processors while maintaining its temperature, for otherwise a chip's power
> > consumption increases as a function of its clock speed.
So a copper even of the same speed should run cooler and use less
electricity...
(and less fan electricity too)
People seem to overlook such things very easily these days. such as
putting down the pasemi cpu because only 2ghz when it only pulled
7watts (compared to 15 for g3 and 25 for g4) - and 64bit yet - could
have put quad in a laptop (sigh).
>
> > A 750 is a 750 is a 750, but the later revision (sometimes called "step", or
> > "stepping") may indicate a revised and/or improved process, which may also
> > indicate a technology shift. But, it doesn't indicate a change in
> > compatibility. Apple controlled its processor cards quite tightly, and a 750
> > of whatever revision is entirely interchangeable with a 750 of another
> > revision.
>
Compatibility meaning the instruction set is the same, and all the
connecting wires, at least from the daughter card to the mobo anyway.
So yes interchangable in that
way.
> > Apple made its early "New World" laptops with the chipset on the processor
> > card. When you change the processor card, you are also changing the chipset.
> > This is not true of the desktops, where the chipset remains on the
> > motherboard.
I'd like to know what this "chipset" actually does. can it also vary
with the revisions
(be updated along with the cpu).
>
> Like Peter said, it won't matter. They are completely compatible with
> each other. So if you were to get yourself a replacement processor,
> you would only want to be concerned with getting a Pismo compatible
> processor card. Aftermarket cards will quite likely have a different
> set of revision numbers. At best, the number would tell you that a
> processor is slightly newer than another one, but is insignificant
> enough that it will make no difference to compatibility or
> performance.
>
> Bucky
I'd go with the newer one if the cost were not too much more. Why
not ?
A little pay to do the right thing, is necessary sometimes (if indeed
the more efficiency).
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