Hey Robert -
This is a pretty subjective question... I can run XP11 on my Surface tablet here in the office, but obviously it won't run well.
My home rig is one I custom built with the following specs:
i7 6600k
32 gb RAM
nVidia 1080ti
2 tb hard drive
500gb SSD
It runs beautifully on my machine, but also keep in mind that I pair it with an Oculus VR headset.
Realistically speaking, pretty much any "performance" or "gaming" desktop will run xp11.
In terms of hardware, I have the Thrustmaster T-Rudder, Saitek Proflight yoke with throttle quadrant, and also have the Thrustmaster HOTAS Warthog for combat flight sim time.
I hope this helps, and let me know if you run into any issues, or need any suggestions of addons!