Grainy/over pixelated on Monitor

[solarasreign]

I'm rocking the MG279Q with a DP cable, when working on Photoshop everything is fine, no problems but when I load a Youtube video, content looks grainy and pixelated in various parts in the video. My 4k TV looks incredibly flawless, sharp and vibrant, so I don't know what is going on with this monitor.

Playing with 'sharpness' or 'vividpixel' do absolutely nothing. I reverted back to reset all the settings on the monitor and the problem remains. Is there a setting I'm overlooking?

This is something that started happening recently and it's driving me crazy.

 

[solarasreign]

Any help would be appreciated it