@izzop .
Nice set up, the cooler fits well in the case and works astetcally overall , one thing you may want to add in the future is a rear exhaust fan but there's plenty of ventilation.
Have you tried a game on your new monitor ?
Rise of the Tomb Raider, that, no surprise, looks much better than it did at 1920x1080!

Certainly an increase in sound from the fans, but that's only to be expected with it set to a 120 Hz refresh.
Regarding the mention of a rear exhaust fan, I'll bare it in mind, but for the moment, like you say there's plenty of ventilation and something to consider for some time in the future.