Hi,
first of all, thanks for all the knowledge you collected around here, have been lurking for a long time. I love tinkering with hardware, but am not a pro by all means, so I’m a bit out of my comfort zone with the details surrounding USB/Thunderbolt.
Problem description:
I have three hosts (2x TB3, 1x USBC) that I want to hook up to my peripherals. Currently, I have to manually switch TB3/USB cables + monitor inputs. I would love to find a KVM (+ possibly audio) solution that doesn’t limit my hardware capabilities (too much).
As with many of you, my setup is a bit special:
- The hosts are:
- Macbook Pro (TB3)
- Rack-mounted PC with ASRock x570 Creator (Corning optical TB3 cable)
- ASRock 4x4 Box NUC-like on my desk (USB 3.2 Gen2)
- I use dual monitors (4K + Samsung Neo G9).
- At the center of my Thunderbolt setup, I have the Caldigit TS3 Lite (Alpine Ridge, only DP 1.2).
- To be able to use HDR with the G9, I use a StarTech TB32DP14 (Titan Ridge, TB3 on TS3 Lite → 2x DP 1.4) to connect both displays.
- My speakers are connected to the dock via optical S/PDIF. (also support HDMI ARC, coaxial S/PDIF, analog and Bluetooth)
- The 4x4 is wired separately (USBC + HDMI 2.0a, currently no sound)
Problems/Nuances:
- Can’t use a USBC KVM directly since the optical cable only works with Thunderbolt 3 ports.
- Can’t use the 4x4 as TB dock host since it would need to support TB.
- Want DP 1.4 for Neo G9 HDR (at least from the TB hosts).
- Not sure if USB bandwidth/peculiarities will limit the Neo G9 framerate vs TB3.
- Would love to have unified digital sound output as well, not mandatory.
Current workaround:
- To switch between TB devices, manually switch TB cables.
- To switch to 4x4, manually switch keyboard/mouse cables and monitor inputs.
Conceivable solutions:
- Thunderbolt 3/4 KVM with support for USBC hosts (most elegant, but doesn’t exist afaik)
- Level1techs 4 input USBC KVM with DP 1.4 + somehow going from TS3 Lite to it (Would need Displayport 1.4 + USB → USBC adapter for DP 1.4 compatibility) [edit: this one doesn’t exist and doesn’t fit, it’s only 2 input + 1 x DP 1.2 out, probably USB bandwidth doesn’t allow for much more?]
- Standard 4 input DP 1.4 KVM with separate dock for the Macbook (probably the safest [edit: and only] route atm)
- Wait for optical TB4 cables[1] and/or hypothetical USB4 KVM (will that even work with TB3 hosts?)
- Anything simple I’m overlooking?
Sorry for the long description, I hope my intention is clear. The whole thing feels like a big knot in my head lol. I’m very thankful for any help untangling it, even just comments on the feasibility or on what to watch out for.
TL;DR:
TB3 ---------\
TB3/USBC ---- KVM -> 2x DP 1.4?
USBC --------/
[1] /r/Thunderbolt/comments/j2wte2/corning_thunderbolt_3_cables_finally_available/g78awfr