Thanks for the information. Is there any benefit to using a single card? I'm looking at the AJA Corvid 88. I've done some testing with a Blackmagic Decklink Quad 2 in an external Sonnet enclosure connected via Thunderbolt 3 (Mac). I'm ingesting video in one input, resizing it, positioning it on screen and outputting that from one of the outputs on that same card. My total system latency is at about 7 frames in this scenario. This includes a video switcher, router, LED wall processor too and I know these pieces of hardware are all introducing some of that latency. Some of my reading suggests that AJA products may reduce the amount of latency. I would like to be able to shave off 3 frames somehow. Thanks for you help!