Since you have AMD APU in use, you'll need to use AMD Overdrive software to monitor your chip temps,
link:
https://www.amd.com/en/technologies/amd-overdrive
2x values are important: socket temperature and thermal margin.
Socket temperature is a real temperature of what your motherboard sees and reports in your BIOS and motherboard utility software (Easytune, A tuning, MSI Command Center, ect). Socket temperature is a great indication of your idle CPU temperature, but it is much less accurate during heavy loads.
Thermal Margin indicates how far the current operating temperature is below the maximum operating temperature of the processor. This temperature is based off of precise calculations that are very accurate during heavy loads. It is perfectly safe to operate in the full envelope of thermal margin. When thermal margin runs out, your CPU/APU will throttle to a lower power state until back in the thermal margin.
Example:
socket temp - 30°C
thermal margin - 40°C
While first is self explanatory, showing your APU idle temp at 30°C as it sits when idle, thermal margin is vice-versa. 40°C thermal margin means that your CPU has 40°C to go before APU thermal throttles.
To put it short: the lower the socket temp - the better. But the higher the thermal margin - the better.
So, what are your socket temperature and thermal margin? Both on idle and under load?