In this video, I build a pretty good gaming pc using a broken computer and some old parts that were sitting on a shelf. I'm actually surprised at how well this gaming computer runs and its a good example showing that you don't need the best hardware to play modern games.
The broken donor system,
intel 5820k CPU (BROKEN)
Gigabyte x99 Motherboard (BROKEN)
16 gigs of 2400mhz memory
No video card
My used parts,
Intel 6800k
ASUS x99 deluxe II
32 gigs of 2666mhz memory
5700xt video card
I reused everything else from the donor system.