NEVER BUY GTX 1080 from GAMERS for mining

I bought a used nVidia Geforce GTX 1080 (Gigabyte) video card from a gamer, now I can’t mine normally. The memory of this video card is overheated, so it cannot be overclocked.
Also in this video I disassembled Gigabyte GTX 1080, you can see what is inside it.