according to the CPU characteristics
According to the what?
the max load Temp is 77 "without overclocking" but also it should be 30C in idle state
77 load, 30'C idle, in what conditions? Where are you quoting this information from?
If it's in XTu, that's going to be 'under perfect conditions'.
Intel well only ever state safe operating temperatures (well, 'max safe' in terms of before throttling) as that's a hard stop. Idle is irrelevant, and subject to too many variables.
30'C idle doesn't sound too out of place, in a ~20'C ambient room
My suggestion would be to take those quoted numbers with a pinch of salt. Without knowing your specific setup, no piece of software (nor...