[freakitchen]

All software-based sensors are going to show different readings, they're fundementally inaccurate, and can only give you an idea of the system temperatures. To be quite honest, an idea is all you need. If you're not experiencing any system stability issues, then you do not have a temperature issue. You can of course use the readings to get an idea of trends - a steady increase in reported temperatures would be an indicator of dust-build up almost regardless of whether the sensors are reporting the 'correct' temperatures. Fundamentally, you'll get the best software readings from your BIOS, though obviously you'll only be able to see idle temperatures from here.