Make sure you installed the backplate correctly if you have an intel processor. One of the sides inside the big "X" has a notch, indicating that it is the top. If the backplate is on incorrectly the cooler will not make proper contact with the CPU. I had this problem with my h100i, the temps were really high after install.
With minimalist information comes little enlightenment. Post more details - AMD CPUs vary from Intel CPUs, which program monitors it matters. Airflow and ambient temperature matters as well.
Make sure you installed the backplate correctly if you have an intel processor. One of the sides inside the big "X" has a notch, indicating that it is the top. If the backplate is on incorrectly the cooler will not make proper contact with the CPU. I had this problem with my h100i, the temps were really high after install.