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There are exceptions, but even then it's not trivial or recommended for most users.
The problem isn't the availability of cards that fit into the slot your Mac Pro might have - it's driver support.
Support for your chosen graphics card must be built into OS X, limiting you to a narrow band of hardware.
For more information about how to find out what graphics card you have in your PC, click here.
Once you know the kind of graphics card you have, visit the manufacturer's website to download the latest driver.
Look here first: Best tools for repairing and upgrading i Phones & Macs If you don't want to do something as drastic as upgrading your Mac, read about how to speed up a slow Mac here.