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iMac (27-inch, Late 2013) - Technical Specifications
upgrade advice for a late 2013 27-inch iMac | MacRumors Forums
Apple iMac 27-inch (Latest Slim Model) i5 12GB RAM 1TB HD OS X Yosemit | Laptop Workshop
iMac (27-inch, Late 2013) - 3.2GHz QC i5 / 16GB RAM / 1TB SSD / Pre Lo – Mac Alert
I got a FREE 2013 iMac 21.5 with internal upgrades including Samsung evo ssd and 16gigs of ram. Then used open legacy patcher to install Mac OS Venture 13.5 beta. : r/osx