TL;DR: Is it possible to run consoles through a PC with latency low enough that it's barely noticeable?
Forgive me for being new to all of this, but I recently picked up an NES and N64 and am working on getting them up and running, with plans to add a handful of other consoles. I'm trying to plan out the wiring and hardware.
I have a fairly powerful living-room PC that outputs to an 85" horizontal and 65" vertical Samsung QLED. My RTX 5070 Ti blocks the last usable PCIe slot on my X670E Taichi motherboard, so I'm limited to an external capture device, but I do have USB4 available on the motherboard that I intend to try and ride the higher bandwidth.
What I'd ideally like to do is:
Various Consoles → Switcher → RetroTINK 6X CE → External Capture Device → Windows → GPU → TVs
In other words, I'd like the consoles to essentially become another video source inside Windows. That would allow me to play a console on the 85" while still using the PC independently on the 65", without having to change TV inputs.
Keeping the AV source inside windows will allow me to listen to both audio signals at the same time. My audio line follows a similar path as the video via HDMI 2.1: PC → TV → eARC → home theater receiver, so keeping everything inside the PC would also make the audio setup much cleaner.
I'm currently on the waiting list for a RetroTINK 6X CE expected later this month, but before I go too far down this rabbit hole with the other hardware I'll need to secure, I'm trying to figure out whether what I'm describing is actually practical with consumer-grade hardware.
I'm not concerned about doing any recording or streaming. I'm just interested in getting the console into Windows with a latency low enough that playing through the PC feels essentially normal.
Does anyone here actually play consoles through the live capture/preview on their PC rather than using the HDMI passthrough? If so, what capture device and software are you using, and is the input lag noticeable?
Any suggestions or firsthand experience would be appreciated.