How to keep an eye on CPU & GPU temperatures, and comparison of software that works best
First you need to know what the safe temperatures for your hardware are. Here is an “approximate” guide. Refer to your hardware specifications for exact values:
If any of your items are going in the ‘danger’ temperature zone, then you need to take some preventive measures.
Even if you see that at idle your temperatures are potentially more than those mentioned, then it is a sign that the overall air flow in your casing may not be enough.
If your idle temperature is very LOW, then it is no reason to be happy, it just means that your fans are running at very high speed and their life is at risk. The components are meant to run near the idle temperature approximations mentioned. So, its better that at idle your fan speed is low.