I've checked all equipments about my CPU and water cooling loop,also discussed tempreture performances with other overclocking gamers.We could draw a conclusion that it is normal hitting 95 degree while running FPU bench,and normal hitting about 70 degree while running cinebench R15.
If there was a delid failure or without delidding,the tempreture will hit 95 or even higher while running cinebench.That means CPU is much hotter running FPU than running cinebench.And dynamometer shows a 500W while cinebench and 620W while FPU which also support the result.
As the youtube link above,that's really wired,prime95 at 5G,that's really insane.None of 7900X overclocking gamers can achieve or even know how he can achieve.MAYBE mesh frequency and voltage are different.