I had a problem also this year with a 212 Evo and z170 7600k cpu couldn’t figure out what was the problem, literally spend a year trying to solve the issue, the issue was the coolermaster 212, somehow it manage to bend the mobo, probably cause bad contacts somewhere XD, my most painful experience.

3v on ram would instaly kill your ram, even trigger PSU over current, that may just a bug on MSI agesa board.