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Please see the official X‑Plane Support page for help.
I am not with Laminar Research; just a flight simmer.
Have a look at the following link found at https://www.youtube.com/user/col2mab/videos where Michael Brown has done a lot of work in recent times regarding the use and comparison of graphics cards. Michael owns a business in the USA that builds PCs predominantly for X-Plane. Laminar Research recommends this business as the only supplier of X-Plane suitable PCs in the USA.
What you purchase will depend on your budget.
This site is no longer being actively maintained.