With the quad2, you can just use a Din to BNC snake to get to the patch panel or other devices. If you don’t have a patch panel, it can be a pain to have different connectors. I like the quad 2 because it is more compact, and with the patch panel it just requires a different snake.
Here is what I am running:
Threadripper 1950x (excessive for CasparCG, not for ffmpeg encoding)
32GB Ram
1TB 960 Pro NVME SSD
Quadro k2200 (caryover from last machine, will upgrade when needed)
Quadro K4000 (donated card)
Decklink Quad 2
If you want to use screen consumers, I would recommend a better graphics card. Running 1 1080i channel and 1 SD channel both with screen consumers for testing results in 40-50% using just the k2200 graphics card. Without screen consumers it is very light on the gpu with that configuration. If you are planning on using it for playout, make sure you have the storage bandwidth. Even NVME ssd’s experience reduced throughput under multiple sequential reads. That said, I have mainly hit that limit during multi file ffmpeg encodes, not using casparcg.
You really need to look at the hardware requirements of each producer or consumer you plan on running on each channel. Specifically storage bandwidth if you are playing/saving high bandwidth video, graphics card requirements for complex renders, and cpu if you plan on running multiple encodes. I would be happy to run some benchmarks to evaluate various setups if you need an evaluation of the k2200. A pascal based card would most likely be preferable. Both of the cards in my system are most likely for sale if I can get my hands on a pascal based card.