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the capacitors on these cards are rated for 90 000 hours(10 years) @70c.
According to Steve Burke at Gamers Nexus you're looking at 5000 or 10000 hours @ 105C.
Not saying it is gospel, just parroting what he says.
Video is here:
https://www.youtube.com/watch?v=3WWfj7RF_z8&t=874sFor everyone's benefit and enjoyment...
Are there really people running their GPU's at 105C?
I dont believe so, to much throttle to run it at that temp
anyway i have run various cards for years 24/7/365 at folding and mining, only lost a couple fans. but i do keep them clean and cool(ish).