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Apple Archive

OS X on Pre-G3 PCI Power Macs

- 2002.06.14

In about 1997, Apple promised that all Macs made then would be able to run Mac OS X. However, when X was released many people were somewhat disappointed to see that it requires a G3 processor to install.

In reality, Mac OS X doesn't require a G3 processor; it can work on older PCI Power Macs. But is yours compatible? Currently, OS X can be installed on a 7300, 7500 (with an upgraded processor; it's not compatible with the 601 processor), 7600, 8500, 8600, 9500, 9600, and several clones.

How do you do this? Other World Computing hosts the free XPostFacto program, which lets you install OS X from an unmodified install CD.

Before you run out to OWC and download the application, you might want to think of a few things. First of all, do you use your pre-G3 Mac for any important work? If so, you probably don't want to install X on it. Second, do you have a lot of legacy peripherals? No USB or FireWire card? Forget printing out a document - the serial port doesn't work with older non-laser printers.

Planned to play a CD in your Mac? Oops, it seems that some CD-ROM drives won't play audio CDs in OS X. However, there does appear to be a patch that may fix the problem. Still, if you need to play an audio CD on your Mac, you may be better off sticking to OS 9.

What about performance? We already know that OS 9.1 on a 200 MHz 604e runs at a reasonable speed. On a 132 MHz 604, it runs slightly slower, but it is still tolerable. We also know that OS 9.1 runs amazingly well on a 300 MHz G3. It has been found that OS X decreases that performance dramatically.

You think you could tolerate your 200 MHz 7600 feeling about 100 MHz slower?

It's not only the processor that will slow things down. It's the bus speed as well. Remember that these Macs run with bus speeds of around 50 MHz. Compare that to the 100-133 MHz bus speeds we have today.

This brings us to G3 upgrades. Even though, as I said, it's not just the processor that's slowing performance down, a faster processor will help compensate for the slow bus speed. A 400 MHz G3 card will not feel as fast as a 400 MHz G3 computer from Apple, but it will make OS X feel faster.

I'd like to hear from anyone who has successfully run OS X on a pre-G3 Mac, especially with the stock processor. I'd be curious to know how the speed compares to that of an actual G3 or G4 (especially in application launching times and startup time). Perhaps I will include some sort of graph in a future article if I get enough responses to do that with.

Recent Apple Archive articles

iPods, notebooks, and other modern electronics more readily replaced than repaired, 12.07. Whether it's an intermittent failure or a broken display cable, more often than not it's cheaper to replace a broken electronics device than repair it.
Options for replacing your older iPod, 11.19. Whether you've run out of space on your old iPod or want features it doesn't have, here are your options in new and used iPods.
Could the $200 'green' PC with gOS Linux become a threat to Apple?, 11.14. The low cost, low power Everex desktop comes with a customized version of Ubuntu Linux, has a Mac-like Dock, and sells for $400 less than the Mac mini.
Leopard different, a bit buggy, but worth the upgrade, 11.02. Leopard on a Power Mac G4 and a MacBook Pro: It runs well on both computers, but each has some odd bugs, and some of the changes are a step backwards.
More in the Apple Archive index.

Links for the Day

Mac of the Day: iMac Core2, Sep. 2006 - Apple introduced the biggest screen ever in an iMac with a 24" Core2 Duo model at 2.16 GHz.
Group of the Day: G-List is for Power Mac G3, G4, and G5 users.
March 21 in LEM history: 00: The compelling Mac - 01: All that for $129? - PowerBook 100 - 02: Improving AppleWorks - 03: The G3 ain't dead yet - Pismo a good value - Western Digital drive issues - 05: iPod halo effect - 06: Rip DVDs so you can watch them on your iPod - 07: Maximum drive size in older Macs - 08: Safari 3.1 fastest browser?
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