Question Cpu Temps fluctuating core to core? default bios oc to 4.7???

[Downtofarm]

Intel i9-9900k
Asus Rog maximus xi hero

Got this combo so I can dabble with OC one day when I start dealing with more intense sims and programs but for now I am only relapsed on classic wow and I dont need anything to be powerful.
I have default bios settings yet hwm is reporting my cpu at 4.7ghz and the temperatures are a little wacky in my experience.
While in IDLE state, the package runs 40-50 degrees and 7 cores are always ~30 or less while one core (random one) is 40-50. The hot core changes every second or faster. Is this normal for cpu with ai overclock? Ive never seen this before. How do I turn it off?

Little tidbit on the side, I had recent RMA my motherboard. Originally i thought my cpu had died but after getting a new i5 and it still didnt work i got a new mobo as well. I9 worked fine with that mobo but it ran very hot due to intel turbo boost and once i shut it off everything was normal.
Could this be a similar issue? Im debating reapplying the thermal paste but I want to figure out thise 4.7ghz thing first.

THanks for the help in advance.

 

[Downtofarm]

https://imgur.com/7EID7Us

View: https://imgur.com/7EID7Us

 

[Dragos Manea]

It is normal to have differences between cores, some cores are sandwiched between others and it will get heat from near cores too so it will heat a bit more, my cpu has 10 cores and i get up to 4-5 degrees differences between cores at full load, take in consideration that is among the last good soldered ihs cpus, most modern cpus has either bad tim or a very thick solder which retains heat inside the cpu package.

 

[Downtofarm]

it it normal to have it swapping which core is the hot core every second tho? this is like a 15 degree difference and its rotating through all of the cores constantly