Leopard- Install on unsupported hardware


macrumors newbie
Original poster
Oct 27, 2007
BY, Germany

I am trying to get 10.5. running on a Sawtooth G4-400MHz. Memory an HD space is sufficient, the only issue is CPU speed.
I installed the harddisk on a G4-FW800 (Dual 1.25 GHz G4), upgraded to 10.5 and reinstalled the disks in the Sawtooth.
It tries to startup, shows the grey Apple-Logo and then shuts-off the Powermac.

It there an additional check Apple installed? Based on all i read about developer versions this should have worked.

Any experiences here?




macrumors member
Aug 18, 2005
Uh, no!

No personal experience with this type of setup, but I have to ask you... if the minimum requirements are twice the speed of your CPU, why would you want to run leopard? People with 1GB of ram on new Intel machines, like myself, have upgraded to 2GB simply because 1GB was waaaaaay too slow, even with Tiger and now you want to run it on a 400mhz system?

There has to be a cutoff point, which is why G3's are no longer supported under leopard, so why would you want to force feed leopard to an old G4?

Its crying out to you and wants to be put in that big electronic retirement home in the sky. Let it go man... let it go :D


macrumors 6502a
Jul 26, 2007
I honestly don't think you will get a good user experience with that setup but I am interested in how it will turn out...
if you succeed I'd very much like to hear how it is.


macrumors 68000
Feb 14, 2004
What do you see when you do a Option-V reboot? What does the log say?
It won't say anything. Command-V may help though :p

See here for cool instructions on making a Leopard install DVD that removes/changes the processor speed check :)

An alternative method is to install Leopard on a supported faster Mac, then image the hard drive. You can then restore the image to your "unsupported" Mac (note: G3s are not invited to the party). There are reports this even works between Intel and PPC Macs, but I haven't confirmed this myself.
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