Author Topic: most common cpu upgrade for a sawtooth?  (Read 684 times)

Offline macStuff

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most common cpu upgrade for a sawtooth?
« on: March 02, 2018, 06:16:12 AM »
i gave a friend one of my sawtooths
unfortunately hes decided to run osx instead of os9 on it
that sucks because i gave it to him to run os9
but he wants to do OSX.. and its his mac now. so what can ya do ;)

just wondering what would be the easiest cpu upgrade for him?
its a 400mhz AGP sawtooth... hes got a Radeon 9550 graphics card
installed that miraculously didnt need flashing to work in the machine
(i guess it was/is a pc card?)

im just wondering what cpu upgrade to reccommend
one that is available + attainable that is
without scowering the earth for years

i was going to suggest that he just get one of the dual 500 original apple cpus
but this isnt much of a bump from 400 to 500mhz

can anyone suggest a more worthwhile upgrade?
(ie going to something above 600mhz? to make it worth the effort?)
and is going to be stable + not require the original cpu to be swapped back in
aka chrisNova777 aka superNova777 aka geforceG4 | >>> http://www.oldschooldaw.com

Offline GaryN

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Re: most common cpu upgrade for a sawtooth?
« Reply #1 on: March 02, 2018, 05:36:28 PM »
i gave a friend one of my sawtooths
unfortunately hes decided to run osx instead of os9 on it
that sucks because i gave it to him to run os9
but he wants to do OSX.. and its his mac now. so what can ya do ;)

i was going to suggest that he just get one of the dual 500 original apple cpus
but this isnt much of a bump from 400 to 500mhz

Actually, in OSX there would be a fairly significant speed bump from a single 400 to a dual 500
Plus, he might actually be able to find one and there wouldn't be any special software / enablers etc. required at all.

Offline reader50

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Re: most common cpu upgrade for a sawtooth?
« Reply #2 on: March 02, 2018, 07:17:05 PM »
Beware you cannot use a dual CPU in a Sawtooth. Duals require a uni-N v7 (northbridge) or later, while the Sawtooth has a uni-N v4 chip. edit - only applies to some Sawtooths - see later replies.

If you use a single Apple CPU from a later machine, also look out for the different buss speed. Sawtooth runs at 100 MHz, while most of the later machines do 133 (and some of the last do 166). ie - an Apple 800 MHz from a QS would underclock to 600 MHz unless you fiddle the multiplier. Which might require soldering.

3rd-party upgrades are friendlier. My GigaDesigns card has jumpers to set the multiplier as desired.
« Last Edit: March 04, 2018, 11:10:00 AM by reader50 »

Offline GaryN

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Re: most common cpu upgrade for a sawtooth?
« Reply #3 on: March 02, 2018, 10:43:07 PM »
Beware you cannot use a dual CPU in a Sawtooth. Duals require a uni-N v7 (northbridge) or later, while the Sawtooth has a uni-N v4 chip.
Well, in THAT case, "never mind"

Offline macStuff

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Re: most common cpu upgrade for a sawtooth?
« Reply #4 on: March 03, 2018, 12:24:35 AM »
there was a test application to see if your sawtooth could accept a dual cpu upgrade or not
i believe i ran this test on my sawtooth yeras ago and it said that mine is compatible?
i remember it made direct reference to northbridge

https://discussions.apple.com/thread/118381

i think that reader50 is partially correct; in that SOME Sawtooth machines are incompatible, but if your particular machine has the vWhatever uninorth then u are in the clear..
like i said i think i ran this test on my 450mhz machine and it was ok
but my friends machine is a 400mhz model; it may not be the same capability, but it just might! tbh i have done that test on a few sawtooths and usually gotten the green light for dual processors everytime.. which leads me to think they made more of the compatible uninorth then the incompatible or maybe i been lucky

anyways tbh im not too concerned about dual processors...

i honestly forget which cpus can be swapped into a sawtooth

Quote
7400 (100mhz) | 7410 (133mhz) | 7450 (133 mhz) | 7455 (133mhz)
i know its a 100mhz machine, so any Mhz #'s from machines that have a 133mhz bus
will not show up as the same # on the sawtooths' 100mhz bus...
that much i remember at least
so taking a cpu from an early Digital Audio G4 (7410)
or a later DA/Quicksilver (7450)
or a 2002 QS (7455)
will not give the same Mhz

933mhz / 133 = 7
so 7 * 100 = 700mhz

this is how it works right??
divide mhz by FSB to get multiplier
than times the multiplier by the new FSB
to get the achievable MHz of the processor
so a 933 mhz qs cpu in a sawtooth will
only show up as a 700mhz

800 / 133 = 6
6 * 100 = 600 Mhz
and likewise a dual 800 QS cpu
will yield dual 600mhz in a sawtooth,

wasnt there also a hack to force the sawtooth to a 133FSB via OC?

733 / 133 = 5.5
5.5 * 100 = 550mhz
so a digital audio 733 mhz cpu would only yield
550mhz in a sawtooth

1000 / 133 = 7.5
7.5 * 100 = 750Mhz
so a QS2002 dual -1ghz
will show up as a dual 750mhz in a sawtooth

do quicksilver CPUS work stable in a sawtooth?
« Last Edit: March 03, 2018, 12:47:25 AM by macStuff »
aka chrisNova777 aka superNova777 aka geforceG4 | >>> http://www.oldschooldaw.com

Offline reader50

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Re: most common cpu upgrade for a sawtooth?
« Reply #5 on: March 04, 2018, 11:07:22 AM »
It took a couple days for memory to kick in. And I missed macStuff's reply. macStuff is right.

Yes, one has to test each Sawtooth. My Sawtooth is a Rev B 350 MHz before upgrading, and is definitely incompatible with duals. uni-N v4 northbridge.

MacBidouille still hosts the checker (I have it saved too from back when). Filename is UniNorthASICChecker.