I have seen some people say GPU with heavy mining for a certain time usually unable to use it as gaming again , anyone got experience on this?
When you run GPUs for a long period of time, 24/7, you are gradually wearing them down. However, ensuring the cards are receiving clean power from a quality PSU and are adequately cooled can help extend their expected life span. Every chip is different, so it's difficult to say exactly how long such a used card would last.