It's better you return the graphic card to the seller, I'm thinking that the gpu is been tampered with, return the card before it's too late, there is nothing I can think about than the gpu is faulty, it's not software issue but hardware issue, might be memory or chip problem
Thanks alot to you & other guys who replied me on this thread.
I have sold that card on OLX by posting an AD that this card is not for mining ( Only for gamers ) so alot of people called me to buy for mining but i denied them. A 22 year kid called me & he wants that card for playing games. i have sold to him by checking at his PC for a game & running furmark for 10-12 minutes. it was working perfectly fine. still i have asked him to check for 1-2 days if it works for his games.
Thanks