I'm continuing this discussion as a new question/problem report because my BIOS does not have a turbo setting.
In my specific scenario (AMD A10-6800K, MSI 2AE0 mobo, 20GB RAM), I turn OFF Turbo Core Control, but when I hibernate the machine then power it back on, turbo is re-enabled. Further, AMD Overdrive still thinks TCC is disabled, so I have to exit & restart AMD Overdrive in order to disable TCC again:
Note that this problem does not occur during normal reboot, when I have "Apply my last settings when system boots" checked.
It looks like AMD O should detect resumption from hibernate and re-activate the configured profile.