You would want HPC off and APM enabled. Someone said they go hand in hand and one is the reverse of the other.
For LLC, I use Ultra. But my settings are not for power savings. It pushing my boundaries. Though it helps lower my temps a bit.
Where are you on the OC by the way?
For optimum power savings, don't OC the FSB or BCLK. Use the default power saving schemes sans Turbo disabled and Cool and Quiet enabled. Enable thise that are disabled by default except HPC.