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My primary gpu is 4 years 4 months old.
Sapphire 7870 2gb memory, bought march 2012.
I dont see the point of upgrading every year.
I've had a 980Ti for about one year. Shouldn't be any chance of needing to get anything faster for quite some time yet. I tend to alternate between brands, so the next one probably will be an AMD card - despite me recently buying a g-sync monitor.