I was just wondering about the Cinebench multicore test....seemed about 5% lower than what most reviews show.....
Because you are running default settings, which reviews do not. To be fair to all parties involved, reviews use the same settings and equipment. In all its DDR4 based cpu reviews, HardwareUnboxed use the exact same 3200/C14 ram for instance. So a person running 3600/C18 ram is going to get a slightly different result. Reviewers also change bios settings in order to maintain specific values, like using setting 3 for LLC instead of Auto. All that's done to level the playing field and make any tests the same across multiple cpus.
There's also variences in motherboards, and especially motherboard software, Gigabyte and MSI for instance, run a much higher vcore on average than Asus or ASRock at Auto, it supposedly gives a performance edge when boosting, but can also mean temps run hotter in general, so pushed to extremes with stress tests, it's possible/probable the cpu can be hitting throttle ranges.
In order to get a clear picture, you'd have to copy the particular reviews settings, otherwise your cpu is going to behave differently to the review sample. That may end up in a gain or a loss.
Reviews, YouTube vids, benchmarks, whatever, only show 1 thing, what is Possible. They do not show what is Probable. 5% difference is close enough to be margin of error, or differences in manufacturing, differences in silicon or Tim or all of that combined.
My cpu happens to land at 104% single core and 107% multi core vs the reference Cpu-Z in Cpu-Z Bench.