PC HW: HDMI x 4, silent 1 slot graphics card: Asus GeForce GT 730

very interesting HW component that enables very efficient multi-monitor setup

GeForce GT 730 Fanless GDDR5 2GB Graphics Card, 4x HDMI @QuietPC

Asus Launches New GeForce GT 730 Like It's 2014 All Over Again | Tom's Hardware

The graphics card comes equipped with four native HDMI 1.4b ports with HDCP 2.2 support and drives monitors with resolutions up to 4K (3840 x 2160).

Amazon.com: ASUS NVIDIA GeForce GT 730 Graphics Card (PCIe 2.0, 2GB GDDR5 Memory, 4X HDMI Ports, Single-Slot Design, Passive Cooling) : Electronics

$90

this could enabled Tony Robbins style interactive solutions

Tony Robbins on Twitter: "Behind the scenes, the calm before the storm!... / Twitter

CANVAS Studio - Tony Robbins UPW Virtual - Immersive Design Studios