ATEN4K USB 3.0 Dual Display KVMP Switch 4 Port CS1944DP (4096 x 2160 @ 60Hz and 3840 x 2160 @ 60Hz; 2-Port USB 3.1 Gen 1 hub, 5 Gbps) Supports MST UK | #1 KVM Market Leader

Awful product. I bought it to use for working from home during the pandemic using my two main screens, my work laptop and non-work desktop plus my surface pro and occasionally my HP server.Well, after weeks of frustration, I've decided it is going back as its next to useless.It crashes my laptop 100% on boot (docking station) UNLESS I press the KVM number immediately before switching on the Laptop. Else it will completely lock up and I have to fully hard boot it.As for the desktop, that's using a dual ROG Swift PG27UQ set up from an MSI RX2080Ti card. It just doesn't work - the PC will do a POST beep, will will not light up the screens.Even if you do bypass the screen and cable direct, the DPI of the mouse doesn't translate through - using Razer Mamba on Hyperflux. The PC and laptop will just see a HID device.Moving a mouse around 27" screen at 3840x2160 @ 60hz is painfully slow.Same forWaste of money DO NOT BUY, or take the risk by be prepared to send it back.Shame really.

I've this KVM running dual 32" 1440p monitors for my home/work setup, 1 laptop, 1 mac and a pc currently.Flawless switching between the mac and pc, the laptop in the dock can be a little finnicky, but that's a common issue with laptop docking stations and KVM's, and as long as you flip the KVM channel before turning on the laptop it's fine (Lenovo Ultradock btw).I've not tested how far I can push the refresh rate yet as the monitors I currently have are limited to 75Hz at 1440p, but looking at the specs, it should handle 144Hz as it's DisplayPort 1.2 compliant.Everything else works great - any USB devices are handed off and show up on either machine correctly, I've a variety of Corsair, Logitech and Razer gear and all are available and recognised by the native control apps.There are a few notes on the Aten website like switching any DisplayPort 1.4 devices to 1.2 compatibility mode to avoid some issues, and I hope that eventually there will be an upgraded version in the future which supports newer DisplayPort 1.4 or 2.0 devices and USB C peripherals.