A:AnswerI personally was not able to. I don’t know if it was the cable I was using or if Xbox changed something but I was only able to enable FreeSync at 60hz.
A:AnswerNot sure what the question is really. You’re going to need a graphics card to run fortnite efficiently. If you can run it without a graphics card (really not recommended) is purely dependent on your CPU and motherboard; not the monitor.
A:AnswerYou can use the monitor with any setup, you just might not be able to take advantage of the full 240hz refresh rate. Games like fortnite or overwatch are going to be the best games for this. I would personally say a AMD Ryzen 7 or i7 paired with a 1080 or 580 if amd would be efficient at reaching the 240hz depending on graphics settings for the AMD cards.
A:AnswerI think the preference of speakers/monitors is your choice as a lot of companies put out good products and also depends if you want RGB in your setup.
However there is a headphone jack under the screen so you can plug in headphones or monitors.
I recommend headphones and Alienwear and Razer put out good headphones.