Are you blending or is each PJ screen independent from each other?
If each screen is independent and you are not concerned with screen tearing when trying to blend several sources into 1 canvas then I would just snag a 4K SDI output card and use that with a decent GPU (4080, 3080ti, etc)
nVidia limits you to (4) outputs per card (1 of them needs to be your UI window, so you only get 3 usable outputs per nVidia card when using a single card.)
with AMD you get (6), but I've also seen a LOT more issues with AMD cards in the past (might be good now?). Running multiple cards is usually a pain as well (and a waste of money if you're matching cards, as only (1) card is used for rendering.)
If you need them sync'd then things just got a whole lot more expensive. You'll need RTX Quadro cards (A6000 gets my vote) or some of these:
https://olympianled.com/product/novasta ... processor/
If you don't need 4K and can settle for 1080p then a Quadro and some of these would get you by:
https://www.datapathltd.com/datapath-pr ... e4QAvD_BwE
Or you can get a beefy CPU/GPU combo and try your luck on these:
https://www.amazon.com/Zowietek-Convert ... B0CGRZ9DQ2
I have one coming in mid December. If it's actually HX3 then there is only 1.5 frames of delay and if you're not blending PJ's, that might be the cheapest option, If they work? (My $1,000 4K Science Image NDI Transcoders work great! but is also $1k...)
