searching for Dual Displayport Graphics Card for 2008 Mac Pro

Thunderbolt Displays don't work with DisplayPort, just Thunderbolt. If you do find a dual DisplayPort card, you could run two of the discontinued 27" Apple Cinema Displays though.

Jtuner77 said:

So what card do you need to run those monitors? I have a feeling you are wrong.

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So what you need to run Thunderbolt Displays? Is that what you are asking? You need a 2011 or newer Mac (exception is Mac pro which has to be the 2013). You can not run a TBD on a 2012 or older Mac Pro as there is no compatible card.

To be more clear: You CAN NOT add Thunderbolt to a Mac via any kind of expansion card. It must be built into the unit.

This is why Apple still sells the old Displayport ACD monitor for use in older (2012 or older) Mac Pros.

EDIT: If you are running Mavericks and do not care about boot screens, you can run just about ANY new Radeon card with dual DP, but again they will not work with TBD.

Apple's Thunderbolt display requires a thunderbolt-enabled computer.
There's no upgrade for your 2008 Mac Pro to add a thunderbolt port.
Although you can add a graphics card with display port, or Mini Displayport, that does not give you a thunderbolt port.
If you want to add that graphics card with display port, then you will need a display that provides a display port input.
Apple's Thunderbolt display doesn't work with a Displayport connection.

Jtuner77 said:

So what card do you need to run those monitors or do I just use a adapter from DVI to minidisplayport?

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As others said it more detail - you can't use a Thunderbolt Display with your Mac.

Mission impossible!