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Please see the official X‑Plane Support page for help.
You should look at the recommended specifications not the minimum specifications for X-Plane 10 at this link http://www.x-plane.com/desktop/system-requirements/
Also look at the recommended specifications not the minimum specifications for X-Plane 11 at this link http://www.x-plane.com/2016/11/x-plane-11-system-requirements-announced/
Whatever you do, go for a Nvidia graphics card rather than an AMD system for better performance.
Hope this helps
Firstly, Nvidia is the chipset used in the design of the graphics card. If you go into you local computer parts store and ask for a Nvidia graphics card they should know exactly what to show you. If they don't then exit the store and don't waste your money within the store.
In relation to Rishi's comments and having read your initial question again I respectfully suggest you need a new computer to do the job.
If you chose to build your own then have a look at the following link to get an indication on where to start. The link is https://www.youtube.com/watch?v=j_YQMSeNM-M
The producer of the video, Michael Brown, is the owner of XForce PC, the company recommended by Laminar Research as supplier of PCs for X-Plane in the USA.
Hope this helps.
From your initial question you indicated your computer (laptop) is aged which suggests that it may be 32-bit rather than 64-bit. 64-bit is the latest technology for designing/building computers.
64-bit technology allows and uses computer memory in excess of 4GB RAM (up to 128 GB - an overkill) whereas 32-bit uses/allows/restricts a maximum of 4GB irrespective how much memory you have in the computer. FSX is based on 32-bit technology whereas X-Plane is based on 64-bit technology. So, if your laptop is 32-bit then I am of the belief that it will not run X-Plane.
If you want to stay with a laptop, to be used for gaming as well, you need to look at either a ASUS or MSI "gaming" machines, preferably 17 inch. One of the problems with laptops is you are restricted in the flow capacity of the builtin cooling fans.
One of the advantages of a PC is you can add additional cooling as and when required as well as upgrading your components at a future date.
For the amount of money you will outlay for a laptop you can build or have built a computure of much higher specifications.
If you want to become "serious" with flight simulation then go for a PC.
Again, I hope this helps.
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