Is your chip completely stable in all workloads? Would it be stable at 90c? when all Dram slots are occupied? When driving all pcie lanes at max?
I bet that you could make any chip unstable with the right tools and knowledge.
Then I ran RAM tests.
Then I ran NVMe stress tests.
Then I ran GPU stress tests (NVIDIA GPU is underclocked).
Then I ran all of these tests together.
Worked butter smooth. Not a crash to this day.
To be fair, -100mV is on the safe side according to the articles I read at the time. Some folks run at -200mV or less. I don't need that kind of tweak.
the reason your chip didn't come like that is because intel plays it very safe when it comes to stability and their margins for error are likely broader than yours, the stochastic nature of the failures means that the voltage margin between one crash for every 2 hours of stress test and one crash for every day of stress test can be hundreds of milivolts, but they're definitely working on it because pat doesn't want you getting free real estate
The only way to test is, unfortunately, to use it until it crashes.