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by adamzegelin
1544 days ago
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I've had good success with a 1x4 KVM from Level1Techs. I use it paired with a Alienware AW3418DW 3440x1440 120Hz G-Sync monitor. My PC has a NVIDIA 2080 and G-Sync+120Hz works fine through the KVM. I also have my MBP connected, via a CalDigit dock, and it can push 120Hz to the monitor too. Level1Techs a small shop that I discovered via their YouTube channel. While they don't manufacturer the KVM themselves (all to common, see the OP link), they look to have done rigorous testing and compatibility analysis. They claim it works up to 3840x2160@120hz because it supports DP 1.4. https://store.level1techs.com/products/14-display-port-kvm-s... |
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I actually did many days of research into assembling my own KVM. HDMI is surprisingly straightforward but DP is a nightmare of nested standards. Just one example: There is support for running i2c tunneled through another protocol. The biggest issue is the link speeds that a DP1.4 cable runs at. The chips needed to do the switching are expensive and pretty much need to be machine assembled. When you get to those frequencies the trace design and board composition even become a factor.
After all that I don't find the $299+ for a good KVM to actually be that excessive. It's surprising how difficult it is to electronically do "I unplug cable and plug another one in".
I don't even need stuff like display spoofing, etc, since I only use one machine at a time and don't constantly switch, but it was just way too much work to put together. If you only need slower link speeds it's doable.