Originally Posted by walnuts
I have an end-user who has an early 2009 Mac Pro. He would like to get the new Thunderbolt display but he needs a new graphics card to run it. Can I throw any Thunderbolt enabled graphics card in the machine?
Currently there is no Graphics cards that will power a ThunderBolt display as ThunderBolt is built into the chipset of the motherboard. At this time you need a computer with Thunderbolt built into the chipset inorder to run a ThunderBolt display. Right now the MacPro, even the current generation, doesn't have the option to run a ThunderBolt display.
Your end-user can use a Apple Cinema Display which display wise is the same as the ThunderBolt Display, both are 27inch with 2560x1440 which can be found Here
Hopefully that is helpful.