Old computer for learning (HX2)

I am looking for a few years old computer to learn network administration, create supporting applications, occasionally for entertainment, editing movies and older games. I would be most grateful for a central unit based on an Intel i-3/5/7/9 6th generation or newer processor, more than 8GB RAM, graphics card with windows 7 or higher.
I would be equally grateful for some old rack server on an intel Xeon processor, e.g. E5, managed switch, etc.
Thank You
Voy
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