You need to run Rainmeter as admin otherwise the Open Hardware Monitor Libary won't work. Copy the HardwareMonitor.dll into the Plugins folder.
These PC hardware monitoring software can keep track of overall system performance.
If you are worried that your computer runs a little hot? Or you are curious to know about how to check CPU temp on Windows 10 & 7? Or want to know if the CPU cooling fans are running properly? This CPU temperature gadget is the best choice you have here to monitor system hardware temperature & performance.