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I don't see simply switching a psu attributing to lower/raising heat to that degree. As said before, vcore is regulated before it hits the cpu from the psu, so it can't be that. It sounds like faulty sensor and/or monitoring application to me. Unless, when you switched the PSU, you happened to clean the CPU HSF and it was absolutely 100% covered in dust bunnies before. I suppose that could cause a pretty big difference, but I'm not sure even that would cause 30 degrees difference.