Thanks for your help. The problem I've run into is that the decklink outputs and the 4090 and 3070 are numbered the same. The 4090 and 3070 are numbers consecutively but the decklink has the same numbers. So if I assign display 2 to the decklink one of the other cards also has the same number. I just have display 1 thru 8 not 1 thru 16. I'm thinking about running two instances of Izzy one for the decklink and one for the nvidia cards. Btw the nvidia cards work very well with Izzy.