A:AnswerPlease review the manual here for assistance: https://dlcdnets.asus.com/pub/ASUS/LCD%20Monitors/VG248/VG248_English.pdf?_ga=2.23256190.59995949.1577121350-852684266.1574109353
A:AnswerYou can connect with these ports: HDMI, DisplayPort, Dual-link DVI-D (support NVIDIA 3D Vision). Please refer to the manual here for assistance: https://dlcdnets.asus.com/pub/ASUS/LCD%20Monitors/VG248/VG248_English.pdf?_ga=2.134166542.1896831170.1576512713-852684266.1574109353
A:AnswerIt will work for 60hz but in order to take advantage of the 144hz you will not be able to use hdmi. A hdmi 2.0 cable wouldn't even be able to run 144hz unless it's plugged into a hdmi 1.4 or higher port which if it had that port it would support 144hz over hdmi natively.
A:AnswerYes it will work. No it does not support gsync natively. For a short time you could buy an upgrade kit and take apart your monitor but they stopped supporting that and don't sell the kits anymore.