Rather than have a database of motherboards and their connections (which is how Everest works) Speedfan shows you the possible inputs and allows you to configure them yourself. That way it only needs to know about the sensor chips. Everest needs an update every time a new mobo comes out which is obviously quite often. Speedfan only needs an update when a new sensor chip is used, which is a much more rare event.
The simple fact is that the temp sensor on your motherboard is capable of having more inputs than it is using, so Speedfan shows you the extra unused sensor. Now that you know it isn't used you can click the configure button and tell Speedfan not to display it.
Then you've only got the high Temp1 & Temp2 to worry about.
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