I was running an Asus ROG Maximus XI Hero motherboard, 2080ti Founder's Edition GPU, 32GB RAM 3200 CL14, and a 750w PSU. To overclock, I used one of the default built in overclocking profiles the motherboard offered for this exact CPU. BIOS was on the latest version as well, and the motherboard rated my cooler (Asus ROG RYUO 240) with a fairly good number. Asus motherboards are able to rate the cooling performance somehow.
The system was able to boot when set to the 5ghz profile. I started the FFXV benchmark (because what's the point of overclocking if not to run benchmarks?) and it started going through it. I have multiple monitors so I was watching temps and voltages during the benchmark on other screens and everything seemed to be within acceptable numbers. Nothing concerning. Suddenly BSOD and the system rebooted. I reset the bios to factory defaults and attempted to boot. From that point forward, the only way I could get into windows was if I forced the CPU to run at a slow speed (I think 4ghz?) across all cores. Anything higher and the system would endlessly fail to boot to anything and reboot. I tried literally everything you can think of before replacing the CPU. Reverted the bios, swapped ram, swapped motherboard, swapped power supply, attempted booting off different media, but ultimately the CPU swap is what fixed it.
Now I'm too scared to do any overclocking.