I was browsing on eBay because I am FINALLY looking to upgrade my trusty 450 Mhz Cube to 10.3 Anyways, there's lots of sellers on eBay selling "upgrade" CDs that are gray in color and have specific model names on them(such as iBook G4). The seller claims that they will work on any supported Mac(such as my Cube) but I know somebody here will know for sure.
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My thoughts are that theres no reason they wouldn't work, just that they'll also support models released after Panther went gold--is that correct?