What's the newest version of OSX I can use?

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Recently acquired an old lamp G4 iMac. What's the highest version of Leopard I can install on this thing? Thanks.
 

dtravis7


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Your Mac's Specs
MacMini M-1 MacOS Monterey, iMac 2010 27"Quad I7 , MBPLate2011, iPad Pro10.5", iPhoneSE
What is the CPU's speed in that G4 iMac? Click the Apple and on About This Mac. Report back.

If it's 867 Mhz and above, you can run 10.5 Leopard. If not, 10.4 Tiger.
 

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