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I’d prefer the one from the maker, though honestly I’m skeptical—they might just adjust the readings to make things look better. Try CPUZ, check all three temperatures, and see what average or typical range feels right for your setup.
Initially avoid starting multiple monitoring apps simultaneously if sensor I/O access might clash. Also, confirm whether the sensor driver has been installed for the specific motherboard model.
There is a driver available for the sensor. For Windows 7, 8, and 10 64-bit, you can find it here: http://dlcdnet.asus.com/pub/ASUS/misc/ut...Vv1010.zip. The source page is https://www.asus.com/us/Motherboards/Z97..._Download/. For extra fun, I used realtemp GT 3.70 for testing.
Generally accepted software results tend to match when compared. Many users rely on third-party tools for temperature tracking and performance enhancement.