Exactly what cable do I need to view this monitor from an HDMI source in 4K 60Hz? HDMI to HDMI only gives 30Hz 4K and I bought an HDMI to DisplayPort cable which unfortunately only works as DisplayPort to HDMI and not vice versa. Thanks for your help.

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Samsung Electronics GmbH 
Hello,
Thank you for your enquiry.
Please check the settings of your graphics card - it should also support and output 60 Hz. Please also ensure that you use an HDMI 2.0 cable. If you have any further questions regarding technical settings, our support colleagues will be happy to help you. They are available from Monday to Saturday from 07:00 to 21:30 under the telephone number 06196 77 555 77.
Best regards from Schwalbach
Your Samsung Service Team

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I'm sorry, I don't use the device.

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Question about Samsung LU28R550UQRXEN

Exactly what cable do I need to view this monitor from an HDMI source in 4K 60Hz? HDMI to HDMI only gives 30Hz 4K and I bought an HDMI to DisplayPort cable which unfortunately only works as DisplayPort to HDMI and not vice versa. Thanks for your help.