04-23-2016, 02:38 PM
10,1 would be a Late 2009 iMac. Apple used two identifiers for the Late 2009 iMac's, 10,1 for the Core 2 Duo models and 11,1 for those with Core i5 and i7 CPU's. The 2010 iMac dropped the Core 2 Duo processors entirely and used i3's instead for the low end of the lineup.