4 Replies Latest reply: Apr 29, 2012 9:17 PM by Allan Jones
tbirdgreg Level 1 Level 1 (0 points)

I have an iMac w/PPC chipset running Panther OS.  Some newer programs I want to use won't work with Panther.  Would upgrading to a later OS work, or is it the chipset that is the limiting  factor?   If upgrading would help, could I load Leopard without going to the in-between system Tiger? 


MacBook Pro, Mac OS X (10.7.3)
  • PattyCakez Level 1 Level 1 (20 points)

    What kind of iMac is it? You can go as high as Leopard (10.5) with a PowerPC Mac if it's fast enough.

  • Allan Jones Level 7 Level 7 (33,460 points)

    Patty is right in asking for more details because of significant model differences in the PPC iMac families, and we can't guess which you have


    • The G3 iMacs 15-inch CRT display) with 400mHz processors and faster can run up to Mac OS 10.4.11 Tiger.
    • The G4 iMacs ("desk lamp") with 1gHz or faster processors can run 10.5.8 Leopard
    • All G5 iMacs can run up to OS 10.5.8.


    Doing "About this Mac" from your Apple menu and posting what the resulting window says for processor type is a good start. Also post what the same window says about how much memory (RAM) is installed. G3 and G4 Macs, if not previously upgraded, tend to be a little short of the RAM needed to run OS 10.4 or 10.5.

  • tbirdgreg Level 1 Level 1 (0 points)

    The computer is an iMac G5 with a 1.33 mhz PPC with 1 G ram.  Made in 2004.

  • Allan Jones Level 7 Level 7 (33,460 points)

    Interesting. The slowest G5 iMac I can find had a 1.6gHz processor.


    Anyway, you can run 10.5 Leopard, but will need more RAM for reasonable performance. 1G RAM is "squeak by" with 10.5.