Year: 2017. Connectivity includes 802.11ac Wi-Fi, Bluetooth 4.2, two "Thunderbolt 3" ports (USB-C connector), and a 3.5 mm headphone jack. Needs HD & Battery. This system also supports "Turbo Boost 2.0" -- which "automatically increases the speed of the active cores" to improve performance when needed (up to 3.6 GHz for this model) -- and "Hyper Threading" -- which allows the system to recognize four total "cores" or "threads" (two real and two virtual).
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