This adapter by Delock enables the connection, for example. Displayport monitor through a free HDMI.

• Specification Displayport 1.2 and High Speed HDMI
• Receiver High Speed HDMI - connection rate to 2.97 Gb / s on a pair of data
• Supports 3D display
• Supports resolutions up to 4Kx2K @ 30 Hz; 1920 x 1080 @ 120 Hz (depending on the system and connected devices)
• Support for 7.1-channel audio with a sampling frequency up to 192 kHz
• Supports HDCP 1.3
• Gold-plated connector
• Color Depth: RGB / YCC (4: 4: 4) - 16-bit color, YCC (4: 2: 2/4: 2: 0) - 16-bit color
• Power consumption: Operation: approx. 500 mW standby mode: approx. 25 mW
• Compatible with any operating system, the installation does not require any drivers