DisplayPort to True 4K HDMI Active Adapter - VC986B, ATEN ビデオコンバーター | ATEN Japan
Amazon.co.jp: StarTech.com DisplayPort to HDMI Adapter - 4K : Computers
Belkin 4K Mini DisplayPort to HDMI Adapter - Apple(日本)
StarTech.com HDMI to DisplayPort Adapter - 4K 30Hz - HDMI to DisplayPort Converter - Compact HDMI to DP Adapter - USB-Powered - Connect an HDMI laptop or desktop to a DisplayPort monitor,