Linux - LMDE (basically Debian) works well for me on a 8-Core model: AMD Ryzen 7 5800X [desktop]. Since all Linux's use different versions of the same kernel, I would expect Manjaro to be fine. I question your supposed reliance on swap though. It is unlikely that you need all 16GB for your...
Can anyone suggest a website on how to install Windows 8.1?
I've never used Windows 8.1 before, although I vaguely remember dealing with W98 and using XP.
I've been using Linux for the last 8 years - which is hugely simpler.
Virtually all drivers are invisibly loaded for me.
In particular...