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Mar 2, 2016 2:39 PM in response to roblm1by braden85,Hi roblm1,
I understand that you have a question about using your mid-2012 MacBook Pro and your Thunderbolt Displays. I have a link for you that contains the information you are seeking, and it can be found here:
3. 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 connected displays Thunderbolt-capable Macs with 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)
- MacBook Pro (13-inch, Late 2011)1
- 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. - MacBook Pro (Retina, 13-inch, Late 2012) and later4
- MacBook Pro (Retina, Mid 2012) and later 4
- MacBook Pro (13-inch, Mid 2012)
- MacBook Pro (15-inch and 17-inch, Early 2011) and later
- MacBook Air (Mid 2012) and later
- iMac (Late 2012) 2
- iMac (Mid 2011) 2
- iMac (Late 2013) 2
- iMac (21.5-inch, Mid 2014) 2
- Mac Mini (Late 2012) 4
- iMac (Retina 5K, 27-inch, Late 2014) 2, 5
- Mac mini (Late 2014) 4
- Mac Mini (Mid 2011), 2.5 GHz 3
Two Thunderbolt displays Thunderbolt-capable Macs that can support up to six connected Apple Thunderbolt Displays. - Mac Pro (Late 2013)
Six Thunderbolt displays
The F8 key does not work when using Windows with a USB keyboard connected to an Apple Thunderbolt Display (27-inch).
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 iMacs listed above 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), MacBook Pro (Retina, 13-inch, Late 2012), and Mac Mini (Late 2012 and later) computers can use an HDMI-compatible device on it's HDMI port while using one Thunderbolt display, or they can use two Thunderbolt displays.
5 If you connect a 60Hz multi-stream transport (MST) 4K display to an iMac (Retina 5K, 27-inch, Late 2014) computer, only one additional Thunderbolt display is supported.
Thunderbolt ports and displays: Frequently asked questions (FAQ) - Apple Support
https://support.apple.com/en-us/HT204154
Thanks for using the Apple Support Communities. Have a good one!
