IME with EVGA, it's the working lifetime of the card. I had an 6600GT which died. Over ~4 years, EVGA replaced it twice, the second replacement they gave me a

IME with EVGA, it's the working lifetime of the card. I had an 6600GT which died. Over ~4 years, EVGA replaced it twice, the second replacement they gave me an upgrade (to a card one generation newer). Almost 10 years later, it still works.