Someone asked this question via support@derivative.ca. Just posting here cause I think its generally useful info…
Please read this document for some background on building a system for TouchDesigner.
[url]https://docs.derivative.ca/TouchDesigner_Video_Server_Specification_Guide[/url]
You can ingest video using cards from Blackmagic or AJA.
[url]https://www.aja.com/family/desktop-io[/url]
[url]https://www.aja.com/family/developer[/url]
[url]Products | Blackmagic Design
If you are working with SDI we recommend using Quadro P4000 > P6000 or RTX range of cards.
[url]https://www.nvidia.com/en-us/design-visualization/quadro/[/url]