Well, yes and no. If you watch his HWINFO instance you can see his clock speeds dropping (AKA thermal throttling is occuring) during an all-core Cinebench run...which with all the splicing and on-screen-capture mouse-scrolling is hard to track the behavior of. Given how CPUs behave like GPUs now--validating the frequency behavior as well as the score is needed, and isn't provided here....which given his conclusion about the proc being too hot for the cooler, makes sense he didn't really bother.
- At 6:11 at the very beginning of the run, he's getting 4.4gHz
- At 6:13, under a 1/4th of the way through the run he's getting about 4.35gHz..at which point he's hit 90C within a few seconds of load.
- At 6:29, the system is throttling back more to 4.28gHz
And ofc, Cinebench on a 8c/16t system is a fast load. It is over in under a minute.
I tried his undervolting video. Didn't care for the outcome; I get better compute results with my AIO and letting the board/CPU manage itself. But I have a 240mm AIO; although I'm now running in a FormD T1. To each their own, go for it--but know you're setting yourself up for a challenge to get it to run well under sustained load. My 5800X under gaming load with a 240mm AIO hits 75C; but it is boosting to 4.85gHz because it has thermal room to do so.