Amazon.com: Plugable Active DisplayPort to HDMI Adapter, Driverless Connect Any DisplayPort-Enabled PC or Tablet to an HDMI Monitor, TV or Projector for Ultra-HD Streaming (HDMI 2.0 up to 4K 3840x2160 @60Hz) :
Plugable Mini DisplayPort/Thunderbolt™ 2 to HDMI 2.0 Active Adapter – Plugable Technologies
HDMI vs DisplayPort: Which is the best? - RTINGS.com
StarTech.com 6ft (2m) DisplayPort to HDMI Cable - 4K 30Hz Video - DP to HDMI Adapter Cable - Passive - DP2HDMM2MB - Monitor Cables & Adapters - CDW.com