PowerMac G3 minitour - identify a 333 MHz motherboard

When I bought my first PowerMac G3 Beige minitour, I didn't know that, for what I was going to use it, I needed the version of 333 MHz, and one I bought turns out to be a unit of 266 MHz. Subsequently, I found a machine at 333 MHz and it's all configured and up and running. Now I want to transform my machine 266 a 333 to have as a backup.

So, what I am wanting to know is this...  If I replace the motherboard on a 333 266 a, that is all that is necessary to make a machine 333?

In addition, the part Apple no on my 333 motherboard is 820-0991-B. This means that if I find a motherboard with Apple no. 820 - 0991 - B, it will be a motherboard 333 MHz or there something else involved in the equation?

If no, is there any there any identification #s on the processor itself I need to know, from (IIRC) it connects?

Thanks for any help,

Tom

The A, B, and C after the logic card number denote a logical Board review, not a processor speed. You want a Rev b or C - Rev A is supported only as a single unit by ATA cable so that B and C models support two - nice addin fo additional drives.

Otherwise, the card G3 Beige of logic in the framework should be fairly generic. The G3 processor is nested, so it is easy to change the processor. One of my Beige G3s (both are rev C) began as a 300 mHz machine and I upgraded the processor at 500 mHz. You can just install a faster processor into the processor socket for a faster Mac - no swaps logic card are required.

Other factors are controlled by a single processor jumper block. See this diagram:

Is Apple is easy with a single base card which can be equipped with different CPU speeds using these riders. The setting for the jumper blocks are here:

https://Web.archive.org/Web/20000505093026/http :// www.bekkoame.or.jp/ ~t-imai/g3a e1.html

More overclocking here:

http://lowendmac.com/1997/overclocking-beige-Power-Mac-G3/

People get into trouble, try to change the bus speed 67 mhz by default and the PCI bus to something higher, especially of you had a sort of installed PCI card. However, you can leave these single speeds and still make some minor adjustments to only the CPU clocking riders.

Apple had factory no block CAP that set all the parameters for a model at the same time. Overclockers remove the CAP from the factory a piece and use of small riders similar to those used on ATA drives (2mm I remember well), or simply to jump the connectors exposed in the block from the factory with a little short of gold thread.

It's been long since I was inside my two beasts of Beige, but if you have any other questions, I can possibly to jog my geriatric memory of these things.

Tags: Mac

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