Thunderbolt Display & Mac Pro
Can I connect a Thunderbolt Display To the MacPro?
Mac Pro (Mid 2012), OS X Mountain Lion (10.8.2)
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The ThunderBolt display requires a Mac that was made with a ThunderBolt port.
The Mac Pro 65lb tower is not currently a member of that club.
It will not work, and there is no known way to make it work.