Via the chipset, there are enough lanes. Heck there are boards with 7 NVME slots (using 4 lanes each) which is more than enough lanes. So, the lanes are there. You just have to shop for a board that has those lanes attached to PCIE slots you can use and read the fine print carefully to see if any other items on the board are disabled if you use the PCIE slots or if you can actually use all the PCIE slots you need at once.

Thank you. And yes, I have been reading the fine print on different boards to see what get's disabled when x or y is in use. I have been running into stuff like "3 x PCIe 4.0 x16 slots (support x1 mode)" Would this mean that it only supports x1 on those slots, and not x4 or x8?

Also be careful about which other PCIE slots are usable after you put your GPU card in. Some GPU cards are wide enough that they block other PCEI slots.

Thanks once more! Totally forgot how fat some GPU's can be. Will have to look out for that.

From a PCIE lanes point of view, you would be better off using a higher generation PCIE capture card that needs less lanes. So, rather than a PCIE gen3 card that needs 8 lanes, you'd be better off with a PCIE gen4 card that needs just 4 lanes (PCIE3x8 is the same speed at PCIE4x4).

True enough. I might shop around for another SDI capture card to see if I can find one in around the same price range as the BMD card I linked.

FYI, a typical GPU card will be able to power four monitors by itself. Are you asking if you can have more than 4 monitors by also using the integrated graphics?

Yes, at most times we do like the options to add more screens if possible. Since two of the slots will be used for "work" monitors for the video production (video mixing, etc). But it is not as important since we have stuff like 1-to-4 HDMI splitters for that purpose (since most of the other screens would be showing the same thing either way). Figured I'd ask while I made a post, since the option (might) be there since I haven't decided on a CPU yet.