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I'd RMA if it were me, and I wouldn't buy a used CPU that looked like that either.CPU wasn't overclocked ever but had -CO, when i was running 6600 2200 it was normal voltages like 1.44vdddio 850-850 vddgs and soc 1.29 vddp auto to 1.15
That is one of the dead/epxloded Ryzens before AMD clamped the VSOC. Discoloration is really similar except yours hasn't exploded yet.