Hi Axel, >Is there a noticeable performance or energy savings difference? If so, I guess this will some time >depend on the load or some other setting (like a laptop that is or is not connected to the power supply)? Intel manual says "software hint to guide the hardware heuristic of power management features to favor increasing dynamic performance or conserve energy consumption." So I guess it's just a hint and make sense when the system load is high. PS: My power-meter didn't show any power consumption difference during idle. Thanks