He too.. I'm not seeing a motherboard temp in Speccy either. Windows 10... Asus ROG G751. I saw it on 8.1 and I'm not wanting to re-install 8.1 to see if it's that, but I'd really like to know if it's a hardware issue.
Could this be due to my new windows 10? Or is there some other issue I should be worried about or is this simply just not an option on the newest version of Speccy?