Open Hardware Monitor is safe. The program doesn’t communicate with a remote control center and so it is not vulnerable to message hijacking over the internet. The purpose of the software only checks the physical statuses of the monitored device and does not tough data files or interact with software services. As an open-source project, the source code for the utility can be read through, enabling the user to check that the program isn’t doing anything untoward.

CPU temp is a typical hardware status that most server monitors will cover. When looking into different server monitoring packages, make sure the tool you are interested in is specifically a hardware monitor rather than an application monitor. If it is a server hardware monitor, it should monitor CPU temp. Standard PC monitoring tools also typically cover CPU temp.