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Are mining gpu's trustworthy?

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I'd go for it. All my cards are 2nd hand. I don't think I will ever buy a spanking brand new GPU. My current RX480 is also a mining card. I mean I don't go blindly in, but in USA you have so much more buyer protection, that you almost always can find a way to get something replaced.
 
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in USA you have so much more buyer protection
Not with person to person sales, unless an actual sales receipt is generated.
 
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Cards that have been used for 1 year of mining are often in better condition than used for 1 year of gaming. Why? Thermal expansion. The chip has undergone far FAR less cold and hot cyclings from load changes during mining, whereas cards used for gaming half a dozen hours a day get cycled constantly. Miners also undervolt their cards.

Personally, I'd rather buy a second hand miner card than a gamer's card.
 

r9

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Under-clocked well cooled only thing you potentially need to worry is fan health.
I was mining for year and a half 22 cards haven't had one card fail on me and 2/3 of the cards I bought them used.
Only issue I had one on GTX1070 one of the fans died and that was it.
Now that I don't mine anymore built two PC to use home with those parts no issues what's so ever.
Having cards running 24/7 kept cold vs somebody used the card for gaming pushed to high temps and then cooled down back and forth stresses the card waaaaaaay more.
 
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Cards that have been used for 1 year of mining are often in better condition than used for 1 year of gaming. Why? Thermal expansion. The chip has undergone far FAR less cold and hot cyclings from load changes during mining, whereas cards used for gaming half a dozen hours a day get cycled constantly. Miners also undervolt their cards.

Personally, I'd rather buy a second hand miner card than a gamer's card.
Interesting take.

From my own experience, I purchased 2x 290x used mining cards after the first crypto boom. They worked flawlessly. I re-sold them in late 2017 during the earlier part of the second mining boom. Got at least as much as originally paid for them.

So yea, from a reputable seller... go for it.
 
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