UHD display problem

Hello

Simply connect my new Dell UP3216Q monitor to my mac pro book.

As stated here (displays use 4 K and Ultra HD TVs with your Mac - Apple Support ), it should work with the port of 60 hz display (monitor is OSH)

However I cannot get this frequency and be stuck at 30z. (no possibility of change in display preferences)

Is anyone using this type of monitor or managed to change the Hz?

Thank you

MacBook Pro (retina, mid-2012)

2.6 GHz Intel Core i7

16 GB DDR3 1600 MHz

NVIDIA GeForce GT 650M 1024 MB

OSX 10.11.1 (B 15, 42)

anyone? Maybe some guys use the 3214Q and card retina at 60 Hz?

Tags: Peripherals

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