Can anyone explain the differences between the late 2012 iMac and the 2013 iMac. I have the late 2012, the first year the mac had the rounded back, and the checkbox does not show up in my Security settings. The documents specify that it is supported on 2013+ models. So what is so different?
This is from everymac.com:
There is one important connectivity difference between the "Late 2012" and "Late 2013" iMac lines.
All of these systems have an SDXC-capable SD card slot, four USB 3.0 ports, two Thunderbolt ports -- which support Mini DisplayPort output for two external displays up to 30" (2560x1600) as well as "Target Display Mode" via Thunderbolt -- one Gigabit Ethernet port (10/100/1000Base-T), one "headphone/optical digital audio output (minijack)" that also supports the Apple iPhone headset with microphone, and support for Bluetooth 4.0.
However, the "Late 2013" iMac systems also support 802.11ac Wi-Fi, whereas the "Late 2012" iMac systems only support slower "MIMO" 450 Mbit/sec 802.11a/b/g/n Wi-Fi.