Another dead MCP355 DDC3.2 almost took my 980x with it.

[86 5.0L]

your 980x is perfectly safe, 100*C is when thermal protection kicks in(aka clock modulation), if the chip keeps getting hotter(around 135 °C, I believe), it will then trip the THERMTRIP# Signal. These cannot be turned off or messed with by the user.

my i7 920 has cruised at 100*C many times before, its still kicking @ 4.2GHz

Your PC BSOD'ed because it become unstable, not because of any safety measures, it would just lock up if THERMTRIP was activated