MacBook Pro Unibody: MacBook Pro (Retina 15-inch, Early 2013): MacBook Pro Core i7 2.4Ghz 15" Retina (E13) -- POI7R5G240E3 MacBook Pro Core i7 2.7Ghz 15" Retina (E13) -- POI7R5G270E3 MacBook Pro Core i7 2.8Ghz 15" Retina (E13) -- POI7R5G280E3