Recert doesn't usually mean damaged and repaired, it usually means some clueless idiot RMA'd a perfectly good product because they applied their own impressively low IQ to troubleshooting.
With some stuff, yeah, repairs are plausible, but CPU wouldn't be, most likely.
But hey, not my job to sell it to people, just putting it out there.
Besides, pretty sure most people here who bought a 970 would void the warranty before that 30 day period was up anyway.