[MacBill]

Hi all--

I just nabbed an indigo 366 from a Yahoo auction and I want to "play" with it. I've read a bunch o' different forums/BBs/sites about overclocking the processor on the Rev A iBooks and the processor/bus on the iBook2 (icebook).

IF this stuff is accurate, my 366 would be able to fairly well spank the pants off (or at least run with) the iBook2.

Rev A iBook -- G3 750 chip, 66MHz bus, x4.5 multiplier = 300MHz
Rev B iBook SE -- G3 750, 66MHz, x5.5 multiplier = 366Mhz
Rev C iBook (FW) -- G3 750cx, 66MHz bus, x5.5 multiplier = 366MHz

Proposed iBook (FW) - G3 750cx, 100MHz bus, x5.5 multiplier = 550MHz!!!!

Per what I've found, the 750cx max multiplier is x5.5, so it's already maxed there. HOWEVER, I've also found specs on the 750cx on a 100MHz bus, I just need to get it there.

I'm willing to attempt this IF I can get instructions to shoot the MOBO to 100MHz.

If need be (and if instructions can be found) I could even set the multiplier back to x4.5 or x5. But if the chip was meant to run at 550MHz, why not try it?

Any help?

[Carl Norum]

Originally posted by MacBill:
<STRONG>IF this stuff is accurate, my 366 would be able to fairly well spank the pants off (or at least run with) the iBook2.

Rev A iBook -- G3 750 chip, 66MHz bus, x4.5 multiplier = 300MHz
Rev B iBook SE -- G3 750, 66MHz, x5.5 multiplier = 366Mhz
Rev C iBook (FW) -- G3 750cx, 66MHz bus, x5.5 multiplier = 366MHz

Proposed iBook (FW) - G3 750cx, 100MHz bus, x5.5 multiplier = 550MHz!!!!</STRONG>

Um, no. The G3 in that Rev C was most certainly NOT rated to run at 550 MHz. I can all but guarantee that you won't be able to push that machine much past 450 at best.

[MacBill]

&lt;http://www.geek.com/procspec/apple/750cx.htm&gt;

[MacBill]

web page

Check it out!!!

[sine -''-..-]

hmm if u could figure out how to blast it up to 100mhz, i wouldnt mind doing it myself... though i'd underclock the multiplyer to keep the process alive

[MacBill]

Sine-

Where are the pix of your iBook? I can't seem to view them in the forum!!

[vmarks]

http://www.bekkoame.ne.jp/~t-imai/ibooke1.html

Tells you how to overclock your iBook.

Taking it to 466 is very possible. Taking it to 500 is a little more risky. Taking it to 533 or higher, probably not a good idea.

[MacBill]

That is for the Rev A iBook.

I need the directions for the Rev C (FireWire). The Rev A and C use different chips. Plus, those directions are for the processor, I need the destructions for the SYSTEM BUS.

[vmarks]

Excuse me for trying to be of assistance.

There is no known way to raise the system bus of your iBook. I don't say that it's impossible, just that it hasn't been done or popularized.

The revision A and revision C iBooks are fairly similar, outside of using an IBM sourced processor instead of Motorola, and slightly different layout of placement for the firewire PHY.

("What," you say, "the rev.A didn't have firewire!" - I point you to this document: http://www.bekkoame.ne.jp/~t-imai/mainj2.html )

I'm sorry you don't find these documents useful, I'm just trying to provide answers that I think are -close- or relevant to your question. Don't beat me up if you don't like what I come up with.

[MacBill]

Sorry for the flame vmarks--

I'm just getting really frustrated with this. I've looked high and low on the net for this onfo and EVERYONE points me to the same page. I've decided to give up and just resolve to install a 512MB DIMM and a 30GB IBM and hope for the best ;-)

Thanks for the suggestions.
Bill

[x user]

I think that perhaps bumping the processor up to 433mhz would be ok. But I doubt the 100mhz bus thing would become a reality. The reason that the iBook2 can run at 100mhz bus is because Apple retarded the speed so they wouldn't compete as much with the TiBooks. It is very possible to run at 500/100 with these iBooks too, Apple just made a stupid decision not too.

[sine -''-..-]

hey i think there may be a way! i just overclocked my machine again today and i noticed theres another pair of jumpers that isnt documented anywhere! its underneith the clock jumpers, and theres two... one has a jumper, one is bare, there r22 or somthing. but they could be the bus speed! though im not at the moment adventurous enough.

edit: you can see them in the picture of the jumper block on the good ol mystic room (http://www.bekkoame.ne.jp/~t-imai/ibooke1.html) the red line of the highlight box passes through the jumpers in question. as you can see the right set of pads is jumpered whil the others are open.

[ 03-19-2002: Message edited by: sine -''-..- ]