A:AnswerHello,
We are unable to provide a solid answer since we have not tested these cards in our system yet, but you will likely have to at least upgrade the power supply.
A:AnswerHello,
We are unable to provide specific FPS information as that is dependent on your in game settings. This PC can easily run Fortnite on high settings, so you will see high FPS numbers.
A:AnswerYes, you should add virus protection. The computer just comes with Windiws defender which does not provide very much protection. You can purchase virus software from a lot of different places. McAfee and Kaspersky are a couple. Just go to Google and search on virus software, and then take your pick.