The must have GPU application to monitor your framerates, GPU temperatures, CPU core usage, fan control (temp/ custom RPM curves) and CPU utilization, and you can customize it to show what you want. Been using it for about 8 years and would not be without it. You can also record your gameplay sessions as well.
MSI AfterBurner 2016-05-21
The Go-To application for GPU teperature / GPU fan control