I have the same motherboard and an Intel i5, but I cannot find the temperature item called TMPiN2.  I only have two temperatures, in BIOS and the same in EasyTune6, although they disagree on the readings.  In BIOS I have CPU at 34c and System at 27c.  In EasyTune6 I have CPU at 21c and System at 28c.  I am using the latest BIOS F21, I do not overclock and my operating system is Windows 8.1 64bit.  Where are you seeing this reading?