I recommend Hmonitor. This software is quite possibly the best hardware sensor monitoring of softwares, temperature of any component on your PC/laptop/notebook/server with a sensor, including Core, CPU, mainboard, HDD, VGA/Graphics card temperatures and so on.
SpeedFan does a good job in most cases SpeedFan
How about just using snmp?
I recommend Hmonitor. This software is quite possibly the best hardware sensor monitoring of softwares, temperature of any component on your PC/laptop/notebook/server with a sensor, including Core, CPU, mainboard, HDD, VGA/Graphics card temperatures and so on.