problably someone else will give you a better answer .

I just read the specification from the website , they say :

http://www.blackmagic-design.com/sup...60#intel_tiger

! 15 August 2006 — Number 060
DeckLink Minimum System Requirements for Mac OS X™

Contents of this support note:
Mac OS X 10.4 Tiger, Mac Pro Configuration
Mac OS X 10.4 Tiger, PowerMac G4 & G5 Configuration
Mac OS X 10.3 Panther, PowerMac G4 & G5 Configuration
Mac OS X 10.2 Jaguar, PowerMac G4 Configuration
Peripheral hardware
Incompatible configurations


MAC OS X 10.4 TIGER, MAC PRO CONFIGURATION

• We recommend the following software versions be used together: Mac OS X 10.4.7, Final Cut Pro HD v5.1.1, QuickTime 7.1.2 and the latest DeckLink v5.7.x drivers. Software versions can be found by following these steps.
"


Again they say that software will work on quicktime 7.1.2 and lasted driver from decklink .

look at your QT version
look at your decklink driver version

If it work on quicktime it should work on catalyst