Actually if your system is reporting high temperature, you will need to check for motherboard manufacturer.
It can be due to any of these:
a) bad integration
b) PSU not ATXv2.2
c) Chassis is not TAC (Thermally Advantage Chassis)
d) BIOS Issues.
Make sure that you are reading the temperature from the BIOS itself.
Steps to try:
Re-integrate the cpu with new clean thermal paste.
Update the BIOS of the board.
If not, fixed, try the system out of the chassis as a test.
Make sure that you have a good PSU as well.
Check with board manufacturer if there is any fix from their side.
Note: the cpu can go up to 71.4C (you can add 5 more degrees to it)