Has anyone tried to install the Blackmagic Declink HD Extreme in Slot 4 of a G5? I know it is a tight fit, but it seems like the card itself is simply the wrong size, since the terminals that slide into the slot are blocked by an extended protrusion from the card. Weird question, I know, but I'm wondering if there are different card sizes for different computers?

You may have PCI-x slots on your computer. My G5 does so the Decklink HD Extreme will not work with it because it is PCI-e. I had to get the Decklink HD Pro that is made specifically for PCI-x.

Since I have upgraded to a MacPro, that card is now not being used. If this is indeed your situation, I can sell the card to you... :)