A: If your video source supports dual-mode DisplayPort (DP++), you can use a passive adapter to send DisplayPort video to a single-link DVI or HDMI monitor. The DP++ video source
performs the conversion instead of the adapter. Source devices that support dual-mode DisplayPort are usually marked with the DP++ logo. If you’re connecting to multiple monitors,
you might need an active adapter.
A: If your video source supports dual-mode DisplayPort (DP++), you can use a passive adapter to send DisplayPort video to a single-link DVI or HDMI monitor. The DP++ video source
performs the conversion instead of the adapter. Source devices that support dual-mode DisplayPort are usually marked with the DP++ logo. If you’re connecting to multiple monitors,
you might need an active adapter.
Q: What is an active DisplayPort adapter?
A: An active DisplayPort adapter converts both single-mode and dual-mode output, so your connected video sources don’t have to support DP++. The adapter performs the conversion
from DisplayPort to VGA, DVI or HDMI instead of the source device. Active adapters/converters are ideal for use with graphic cards such as AMD Eyefinity™ that do not output dual-mode
signals.
Q: How to tell if a DisplayPort adapter is active or passive
A: Basically, if the adapter includes a little box that houses the conversation chip it is active. If the adapter cable is no bigger than a regular plug, it is most likely passive.
Reference: https://www.eaton.com/us/en-us/products/data-video-cables-accessories/usb--thunderbolt-and-lightning-cables/what-s-the-difference-between-passive-and-active-displayport-ada.html