A:AnswerThis CPU should work perfectly fine with the mentioned GPU. The 9th generation Intel CPUs have a big bang so paired with the 2070 super you should be able to run almost any game you throw at it.
A:AnswerAs long as you have two separate cables, 1 HDMI and 1 DVI you should have no problem. I believe the card can handle up to 3 outputs at one time.
A:AnswerYes you need an additional 8 pin power connector to connect it in addition to the 6+2 connector. Otherwise there is not enough power from just the 6+2 pin connector and it will not work. After you get an 8 pin connector just look for a open 8 pin slot going out from the power supply and connect it like the 6 pin. Once you put in the 8 pin and 6 pin connectors the card will run perfectly. Hope this helps.