To follow-up on Mark's post -- I was able to do some capture tests of 3 streams a few months ago with the same deck link quad card and had somewhat mixed results. With 3 streams I would see a significant number of dropped or duplicated frames, and/or bad artifacts.

I don't have the quad handy currently but I'd be happy to pass my test notes on to Mark in case recent changes in izzy may have helped out with the dropped frame issue.

Best,

Ian