802.11ac Wi‑Fi wireless networking IEEE 802.11a/b/g/n compatible.Two Thunderbolt 2 ports (up to 20 Gbps).Both the single and multi-core tests showed a mere 3 to 6 percent.
Native resolution: 2304 by 1440 pixels (Retina).Retina display: 13.3-inch (diagonal) LED-backlit display with IPS technology 2560-by-1600 resolution at 227 pixels per inch with support for millions of colors
Retina display: 12-inch (diagonal) LED-backlit display with IPS technology 2304-by-1440 resolution at 226 pixels per inch with support for millions of colors