how many years can gpu (gtx 970) live?

Solution
Do you mean in terms of contemporary released game titles and performance? Or do you mean physically working?

I have 20+ year old video cards that are still kicking around. A pretty good sample of all the technologies throughout the history of PC gaming. But obviously most don't work for running modern games (or are physically incompatible with newer hardware)

Fans are the most vulnerable part of a GPU. They may need replacement at some point. Next would be the power circuitry and capacitors. Though electrolytics are quite rare these days. The integrated circuits should last a long time, at least 10 years. (Though these newer process nodes haven't been around that long to really tell)
Do you mean in terms of contemporary released game titles and performance? Or do you mean physically working?

I have 20+ year old video cards that are still kicking around. A pretty good sample of all the technologies throughout the history of PC gaming. But obviously most don't work for running modern games (or are physically incompatible with newer hardware)

Fans are the most vulnerable part of a GPU. They may need replacement at some point. Next would be the power circuitry and capacitors. Though electrolytics are quite rare these days. The integrated circuits should last a long time, at least 10 years. (Though these newer process nodes haven't been around that long to really tell)
 
Solution
Board failures are very high for the first dozen or so hours of use. Then the failure rate drops to it low point for about 10,000 to 20,000 hours of use. Then the failure rate rises again. So you should get 500 days or so before you begin to leave the best part of the failure rate curve. At a guess most gtx970s will last 10 years, but a significant number will not get there. Heat, OC with voltage will both increase the probability of an early fail.

Aside, there is a factory overclock on the Gigabyte GeForce GTX 970 Xtreme Gaming. In the cards favor for long life are (cooler temps with custom cooler, the best sorted chip from nvidia, better than typical components (e.g. chokes and capacitors) and cooling for critical components) this somewhat offsets the factory OC.

Aside 2: better case ventilation that reduces the operating temp of the gtx970 will significant increase it's expected life and likely your MB's life.
 

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