SIW - System Information for Windows
"Everything you want to know about your computer"
SIW - Sensors
reads PC systems main health sensors : voltages, temperatures, fans speed.
The program handles the most common sensor chips, like ITE®
IT87 series, most Winbond®
ICs, and others.
In addition, it can read modern CPUs on-die core thermal sensors, as well has hard drives temperature via S.M.A.R.T, and video card GPU temperature.
Special hardware monitors such as abit®
uGuru and Gigabyte®
ODIN power supplies serie are supported too.
uses CPUID's System Monitoring Development Kit
The temp readings in the bios have been tweaked in the bios's code such that they're quite accurate for the particular mboard model.
Third party hardware monitoring programs make assumptions about the sensor readings that may not be correct for the particular mboard model.
Sometimes sensors for something are not connected to the intended inputs on the hardware monitoring chips - the mboard manufacturer compensates for that, but SIW doesn't.
SIW may show a reading for an input no sensor is connected to - it never changes in that case, and may even be an impossible reading.