I ended up doing a lot of research into why my windows don't stay where I placed them when I switch computers. It turns out that the DisplayPort specification requires sending a monitor-off signal. You absolutely must use HDMI if you don't want this problem. I was able to use other KVM and HDMI DisplayPort cables without any problems. If that's not your main concern, this is a fantastic KVM. It had no trouble moving the 4k and WHD display. Switching was quick, it took me minimal effort to get my gaming keyboard and mouse up and running.
TESmart 1080P 60Hz USB VGA KVM Extender Over Cat5e Cat6 Ethernet Cable - Long Range 984ft/300m (Sender+Receiver)
10 Review
4 Port USB 3.0 Switch Selector - Pubioh KVM Switch for Mouse, Keyboard, Printer, Scanner - 2 in 4 Out Sharing Box with Switch Button and 2 USB 3.0 A to A Cables
11 Review
π TRENDnet TK-803R: 8-Port Rack Mount KVM Switch with VGA & USB Connection, USB/PS2 Support, Device Monitoring, Auto Scan - Control 8 Computers/Servers
10 Review
CKL 4 Port KVM Switch Dual Monitor DisplayPort 4K 60Hz: Unprecedented Multi-Computer Control with Audio, USB 2.0 HUBS, and DP 1.2
11 Review
Computer case Deepcool Matrexx 55 black
55 Review
Zalman Z3 M ATX π» Tower Computer: A Compact and Powerful Machine
77 Review
Fractal Design Define R5 - ATX Mid Tower Computer Case - High Airflow and Silent Optimized - Includes 2x Dynamix GP-14 140mm Silent Fans - Water-Cooling Ready - Black
43 Review
Fractal Design Node 304 - Black - Mini Cube Compact Computer Case - Small Form Factor - Mini ITX β mITX - Enhanced Airflow - Modular Interior - Includes 3x Fractal Design Silent R2 120mm Fans - USB 3.0
42 Review