A:AnswerYes it will be fine with an mpg z390. I have an msi mpg z490 gaming edge motherboard in mine and it fits perfect. Did not even have to remove or change any of the pre installed stand off screws.
A:AnswerThe case has nothing to do with connecting a monitor to it. It's literally just a box that you put stuff in. The connection to a monitor comes from your graphics card.
A:AnswerI am strictly liquid cooled and the temps are terrible. The case currently has a major airflow design flaw caused by its top and front covers. I left a review of my findings if you are interested in reading it.
A:AnswerYes it will but thermals in this case are not the best I’d look into the airflow 5000 from Corsair since it’s about the same dimensions just better built