@
lex MBP的话，算上内置显示器和 HDMI 最多能支持4个显示器。
14. How many Apple Thunderbolt Displays can I use with my Mac in OS X?
The table below indicates how many Thunderbolt displays can be connected to Thunderbolt-capable Mac computers in OS X.
Computer Maximum number of connected displays
Thunderbolt-capable Macs with only Intel HD Graphics 3000 integrated graphics can support one connected Apple Thunderbolt Display (27-inch).
MacBook Air (Mid 2011)
MacBook Pro (13-inch, Early 2011) and (13-inch, Late 2011)
Mac mini (Mid 2011), 2.3 GHz
Mac mini with Lion Server (Mid 2011)
One Thunderbolt display
Thunderbolt-capable Macs that can support up to two connected Apple Thunderbolt Displays.
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MacBook Pro (Retina, Mid 2012)
MacBook Pro (13-inch, Mid 2012)
MacBook Pro (15-inch and 17-inch, Early 2011) and later
MacBook Air (Mid 2012)
iMac (Mid 2011)
Mac mini (Mid 2011), 2.5 GHz
Two Thunderbolt displays
1 You can connect a second Apple Thunderbolt Display (27-inch) to a MacBook Pro (13-inch, Early 2011) and (13-inch, Late 2011), but the built-in display on the MacBook Pro will go dark. This is expected behavior.
2 iMac (27-inch, Mid 2011) with two Thunderbolt ports supports a total of two Thunderbolt displays regardless of which Thunderbolt port each display is connected to.
3 Mac mini with AMD graphics can support an HDMI compatible device on its HDMI port when using two Thunderbolt displays.
4 MacBook Pro (Retina, Mid 2012) can support an HDMI-compatible device on its HDMI port while also using two Thunderbolt displays.