@japamac "Hi- This is a compatible upgrade (according to the maker):
http://www.rme-audio.de/enproducts_hdspemadi.php#5
I'm pretty sure the above hardware is out of budget for even the majority of Mac Pro users. If you're dishing out $1500+ for a sound card, a Mac Pro is probably not the machine you're looking for, nor are most traditional computing options.
If sound is a priority however, you can always bootcamp, and just move your cable to the on-board jack when reverting to OSX. OSX will not object to the foreign hardware, but just ignore it.
Creative offers a wide variety of cards in a more realistic price range.
Message was edited by: schulmaster