reply to Jan Janowski
Re: I can't believe I missed this! They ship systems like that because it saves in power, which is particularly important for laptops. Since most people don't notice the difference between HT or not; their more interested in battery life, hence the no HT and auto underclock.
But this BIOS setting Over-rides the Control Panel Power settings!
I can almost (Not quite-- Why overly complicate a system with two controls in series doing the same thing?) understand why on the laptop... But on a Professional Server? WTF?
Looking for 1939 Indian Motocycle
Same reasons I guess...power saving is increaingly needed in Datacentres, but it should scale accordingly. If it was manually set, then that is bizzare.
Stillman Valley, IL
Servers they also want to reduce heat for cooling the data center. Letting the CPU slow down when not needed will keep the server cooler.
Dynamic Acceleration was the precursor to Intel Turbo Boost. If core1 is idle and core2 is under heavy load (say from a single threaded encoder) core1 would slow down and Dynamic Acceleration will overclock core2 while keeping the CPU within it's thermal limits.
SpeedStep is the technology that allows for the cpu speed to be dynamically lowered depending on load thus generating less heat and consuming less power. In a datacenter not only do they have to pay for power but they also have to pay to get rid of that heat.
It's only logical for there to be an option to specifically enable or disable Dynamic Acceleration in the BIOS. As far as I'm aware (maybe someone can correct me on this) the BIOS is the only way to specifically enable or disable it without using 3rd party software? Also remember not every server runs an up to date operating sytem, or even an operating system at all so the BIOS might be the only way to change newer power management settings.