How to set up Linux for full AMD APU power management support: Turbo Core, Cool'n'Quiet, Dynamic Power Management?

My objective is to set up a mini server (not HTPC) with low power consumption in idle mode, yet offering nice performance when used. The focus is more on data safety than availability. In other words: quality parts, but redundancy only for storage. Not considering myself to be biased, after some research I felt that some AMD desktop APUs would offer good value. Questions remaining are: - Will the idle state of the GPU lower power consumption and unleash resources for the CPU? - Will Cool'n'Quiet and Turbo Core lead to the intended low power consumption in idle mode but performance under load? - Will Linux support this scenario as intended? Quite a few questions and forum discussions seem to suggest that this is not necessarily the case.