Monitor is blinking... but Why?

Connected 4k monitor to imac mini (2012) via miniDP-to-DisplayPort => monitor started blinking (the resolution here was 2560x1440). If conect it via hdmi-hdmi cable everything is OK except for blurrrr due to non-optimal resolution.
Help me to fix the blinking please!

Like because Apple does list the 2012 Mini as supporting 4K. Sometimes a monitor with a specific connection will scale down.
What does the manufacturer say about using yur monitor at less than 4K?
Supported displays and configuration
You can use 4K displays and Ultra HD TVs with these Mac computers.
MacBook Pro (Retina, Late 2013 and later)
Mac Pro (Late 2013)
iMac (27-inch, Late 2013 and later)
Mac mini (Late 2014)

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