Re: [Thinkpad] CPU Upgrade for 770Z - Anyone Tried PIII 500MHz after Switching 64MB Onboard Memory to 100MHz?

I have never tried it, but it does seem possible.
OTOH, I have an A20M that is made for the Celeron 550. It will work with a
P3 700 chip, BUT it only sees it as a C550!
----- Original Message -----
From: "Philip Kiff" <pkiff@sympatico.ca>
To: <thinkpad@stderr.org>
Sent: Saturday, August 30, 2003 8:00 PM
Subject: [Thinkpad] CPU Upgrade for 770Z - Anyone Tried PIII 500MHz after
Switching 64MB Onboard Memory to 100MHz?

> QUESTION
> Looking into the maximum CPU upgrade for a ThinkPad 770Z. From what I can
> gather, there is general agreement that a PII 400MHz MMC-2 card is the
> maximum stable upgrade. However, back in July and early August there were
> suggestions (here, as well as over at Google Groups and at ThinkPads.com)
> that if one swapped the 64MB "onboard" 66MHz SO-DIMM with a 100MHz
SO-DIMM,
> then it might be possible to use a non-Speed Step PIII 500MHz. Has anyone
> actually attempted this yet? What were the results?
>
> BACKGROUND
> For those who haven't been following the 770Z/600E upgrade saga, here's
what
> I've picked up from the lists I've read. Neither the 600E nor the 770Z
can
> use any Speed Step enabled PIII because the notebook motherboard must have
> been designed specifically to perform certain off-chip processes required
by
> a speed step chip. However, a non-speed step enabled PIII in the MMC-2
form
> factor can sometimes be installed in either of these machines, but the
> result is a somewhat unstable machine which requires that you perform some
> sort of ESC key sequence on boot-up in order to get around an error
message.
> Extensive testing has already been done on the 600E series to try to get
> around this without sucess. One popular theory seems to be that the
problem
> is that the "onboard" memory in the 600E is a 66MHz 64MB chip soldered
onto
> the motherboard. The PIII has a 100MHz FSB, and I guess the idea is that
> the speed difference with the 66MHz chip causes a boot error. (?) The
> "onboard" memory in the 770Z by contrast is apparently a regular SO-DIMM
> chip in a standard (though difficult to access) memory slot. If I
> understand correctly, the hope was that since the "onboard" memory is not
> soldered on the 770Z board, that it could be swapped for a 100MHz chip
which
> would thereby allow a (100MHz FSB) non speed step PIII chip to boot
> smoothly. Then I guess the question would be whether the 770Z could deal
> with whatever additional heat buildup the new chip created. I don't
really
> know about this stuff except from what I've read on the various lists, so
> feel free to correct/augment the explanation above.
>
> Phil.
>
>
>
>
> _______________________________________________
> Thinkpad mailing list
> Thinkpad@stderr.org
> http://stderr.org/cgi-bin/mailman/listinfo/thinkpad

_______________________________________________
Thinkpad mailing list
Thinkpad@stderr.org
http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
Received on Sat Aug 30 20:46:14 2003