Follow the advice from disc in his last message about 2 hours ago at the time I post my message.
I don't know where you reside so here is some assistance in making a decision on what to acquire. If you plan to purchase another PC consider a purpose built PC rather than an OFF-the-shelf (OTS) unit. A purpose built unit gives you a greater scope to upgrade individual components over and above OTS units as and when X-Plane is developed further.
Have a look at the following link found at https://www.wired2fire.co.uk/flight-sim This business is in the UK and my contacts indicates it is considered as one of the best in the UK for supplying PCs suitable for X-Plane.
Alternatively have a look at the following link found at https://xforcepc.com/english/flight-simulation/flight-simulation-computers.html Laminar Research recommends this business as the only or preferred suppliers of PCs suitable for X-Plane within the USA.
Both of these businesses use NVidia graphics cards and Intel processors to get the best benefit from X-Plane.
Now, if you are planning a different machine have a look at the following link found at https://www.youtube.com/user/col2mab/videos The videos are produced by Michael Brown who owns XForcePC in the USA. Take time and trawl through the video listing and have a look at the videos that may appeal to you. I use this site for a lot of my information regarding X-Plane and the building of my 2 PCs for X-Plane.