AIO running at 280MHz

PowerPC Macs

After messing with some jumpers on my G3 AIO, I have bumped the 233MHz CPU up to 280 with Nary a hiccup. The bus is running at 70MHz and the PCI is running 35MHz. This is going to be great once I get the 300MHz Zif over the internet. If anyone wants to know, this is a Rev 2 Board, and can handle 2 IDE Chains with 2 Drives on each IDE Bus I will post Pics (Screen shots) of the machine once in OS X (Got reinstall)

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coius's picture

And she is still humming along beautifully.

I have added 2 fans. One PCI Slot Fan, and one directly on the CPU Heatsink. It has not had one freeze yet. This makes the 6th hour it has been running notstop ( I did the fan adding while it was still running to keep the tests accurate)

coius's picture

280 MHz Snapshot

And there you have it folks. Probably one of the rarest species of 280Mhz G3's. Krikey! and it's a fast one! You should see how well it outruns Panther! It just blazes a trail for all of those AIO Elusive Beasts!

Sticking out tongue

EDIT: I still haven't gotten the hang of BBCode

coius's picture

If anyone wants..

I can post the jumper settings. This will allow anyone to do this with no hassle.

It's basically shorting the pins

XX
XX -2 Short
XX
XX -4 Short
XX -5 Short
XX -6 Short
XX
XX -8 short
XX -9 Short

You can just pull the red block off *Carefully* With a small pair of needle-nose pliers. Once it is off, regular HDD/CD-Rom Jumpers will work. I used them, and if you are carefull about putting them on, they won't wreck the pins. But keep in mind, just don't go jamming them on. But it will be a little bit of a tight fit.

And overall, take it slow if you overclock it. Remember to not just ramp up the speed, and have plenty of patience. It will take a while to experiment, as it took me 1 hr to find the correct jumper settings (this is the highest I could do, before the internal CRT would not turn on. Even though the external Port worked)

It was worth it, as OS X. 3 is very responsive, and doesn't lag very much. Which is saying a lot, considering that my VRAM in this is still at 2MB. All-in-all, it was worth it. I still can't wait till the 300MHz CPU comes, and then I will clock that one up.

Anyone have any idea what they can be clocked to tops?

coius's picture

Note:

I have only done this with the 233MHz G3. When I get the 300, I will post the results of overclocking that one