Hmm well it looks like your core is clocking down correctly, is your voltage clocking down as it should?
Try putting the memory as low as it will go and see if that kicks it in to proper idle mode.
Overdrive should be disabled for a start, you've enabled it.
If you run that together with afterburner it could conflict. You shouldn't even enable it if you plan to use afterburner for overclocking.
"Enable Graphics Overdrive" is unticked, though?
Just to make it clear - my memory wouldn't downclock even before I opened CCC. First thing after installing the drivers I checked GPU-Z and memory was stuck at 1200.
Yes, the core is clocking down correctly and I think voltage is as well.
Idle

Load
