MSFS 2020 has been announced, in beta, will probably be available this summer. Here are the hardware specs:
- Core i5-2500K 3.3GHz. FX-8320. 2.5. Login. GeForce GTX 960 2GB. Radeon R9 380. 3.1. Login. 2 GB. ...
- Core i5-7400 3.0GHz. FX-8370. 2.8. GeForce GTX 1060. Radeon RX 480 8GB. 7.3. 8 GB. 7.5. ...
- Predicted Requirements. Core i7-6700K 4-Core 4.0GHz. Ryzen R5 1600. 8.8. Login. GeForce GTX 1070. Radeon RX Vega 56 8GB. 9.2.
It may be more practical to use MSFS X or even MSFS 2004 - you can pick up a copy much cheaper and it runs on less powerful computers. In fact I'm running both on my old Windows 7 system with 8 GB memory and not a super-highpowered-chip or graphics. Of course I don't run max quality graphics, either. But for IFR training, you don't need the really good graphics.
Since you'll be doing this remotely, consider the student's and your network speeds. Also what software will you be using for remote display of your screen? Skype? Google Hangouts? Or will the student have the same software and display their screen for you to see what's going on?
Your old monitor is fine for now. Also remember that your hardware (even the small Surface screen) is irrelevant to what the student is seeing. They may also have a small screen or may be using a very large monitor - something you cannot control. Besides, it's IFR training. We don't look out the window, just reasonably quality display of the instruments and perhaps the corresponding map is what you need.
My personal preference is X-Plane 11 but again, you need horsepower. I'm still on X-Plane 10 because of that. Would rather spend the money on the airplane than another computer.
I've done a great deal of remote training but never tried it with a flightsim....something to try out later this week with our next snow storm. (Colorado)