Apple lists compatibility between the 5K monitor and certain Macs. Note they say you can use some older Macs that do TB2 at 4K if you use the TB3 - TB2 adapter. But note they do not mention the Late 2013 rMBP that does 4K@60Hz via TB2 ports (the first rMBP to do TB2). So has anyone tried to hook up a 2013 rMPB to the 5K monitor @ 4K? Any technical reason anyone thinks it won't work on a 2013 but does on 2014 models? With the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter and a Thunderbolt cable, you can use the LG UltraFine 5K Display at 4K and lower resolutions with these Mac models: 3840 x 2160 @ 60Hz Mac Pro (Late 2013)* MacBook Pro (Retina, 15-inch, Mid 2014) and later MacBook Pro (Retina, 13-inch, Early 2014) and later iMac (Retina, 27-inch, Late 2014) and later iMac (Retina, 21.5-inch, Late 2015) iMac (21.5-inch, Late 2015) MacBook Air (13-inch, Early 2015) MacBook Air (11-inch, Early 2015) 3200 x 1800 @ 60Hz Mac mini (Late 2014)* *Apple recommends that you use the LG UltraFine 5K Display as a second monitor with Mac mini and Mac Pro, as the display might not turn on until you boot into macOS. As a result, pre-boot features such as Boot Picker and macOS Recovery might not be available on the display.