AW2518HF I cant set 240hz, only 60hz

[zboczonyhektor]

Hi,
I just bought Dell AW2518HF and I cant set it to 240Hz, there is only 60Hz available in nvidia control panel. I connected it via display port to nvidia gtx 780. Any suggestions?

 

[Glenwing]

Please see section 6 here: http://www.tomshardware.co.uk/forum/id-3675170/connect-120-display-construction.html