Question CPU overclock questions

Dec 9, 2019
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My system consists of

8600k with hyper 212 evo with 2 fans
msi z370m mortar
16gb ddr4
1tb m.2 ssd
rx 5700xt
650w corsair psu

I overclocked my cpu to 4.7ghz at 1.2 volt
When running cinebench r20 the freq is usually 4.7 but toward the end of the test it drops to 4.5-4.6.

question 1: Do I need to set a voltage at this freq or can I keep it on auto?

question 2: Is the cpu freq supposed to fluctuate or is it normal?
 

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