Yup, as everyone else suggested, get Motherboard Monitor.
Here's how I set it up on my 8K7A:
Go into the settings.
Click on the "Temperatures" section.
Set sensor 1 to "Via 686B Sensor 1"
Set sensor 2 to "Via 686B Sensor 2"
Set sensor 3 to "Via 686B Sensor 3"
That should allow you to view both the processor (sensor 2) and motherboard (sensor 3) temperatures for your motherboard. I'm not quite sure what the first sensor does, it always reads between 22-24C for me. Maybe it has something to do with the air temperature inside the case??
Good luck!
Nick