I followed these instructions for temp monitoring in Rivatuner:
6- Go to the "Power user" tab.
7- Expand \Monitoring.
8- Click on the left side of "BackgroundMonitoring".
9- Double click on the right side of "BackgroundMonitoring" on the darker area.
10- Enter 1.
11- Expand \Core Temperature.
12- Click on the left side of "ShowInIcon".
13- Double click on the right side of ShowInIcon.
14- Enter 1.
15- Click OK