just built this

[Detale]

The multiplier will set the whole CPU not one specific core. There is an option in there somewhere called CPU thermal management you need to disable it or it screws with you Also I didn't see clockers post. That dude is everywhere.

[clocker]

the cpu-z core speed keeps going back and forth between 2000 MHz and 3000MHz with the multiplier going back and forth between x6.0 and x9.0. there is only one multiplier option under the bios. i didn't notice where i could set one for the other core or something.

In BIOS...
-under "Advanced BIOS" options, disable "C1E"
-under "Motherboard Intelligent Tweaker", disable "C.I.A.2".

These two power saving settings throttle back the cpu speed (by switching the multiplier) when the chip is not under load.

You are using a very old version of RealTemp. Get the new version here.
The thread is ridiculously long but contains all the info you'll need to calibrate the app and set your display options as well as testing your sensor sensitivity.

Now that you're stabilized at 3GHz, it's time to see how low you can set the vCore and remain stable.
I like OCCT for stress testing...set it to "CPU" and run for an hour.