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9 Technotes
EIST (Enhanced Intel
®
Speed Step)
This allows the processor to meet the instantaneous performance needs of the operation being performed, while minimizing
power draw and heat dissipation. Processor clock will be at its minimum possible frequency when in IDLE. When performing
CPU loads, it will change its frequency up to its maximum frequency. In summary, the OS controls the frequency if EIST is
enabled.
Note: If EIST is disabled in setup, the CPU will run at its maximum speed. Turbo Boost Technology won’t be available.
Turbo Boost Technology 2.0
Intel
®
Turbo Boost is a technology that enables the processor to run above its base operating frequency via dynamic control of
the CPU's "clock rate". It is activated when the operating system requests the highest performance state of the processor. The
increased clock rate is limited by the processor's power, current and thermal limits, as well as the number of cores currently in
use and the maximum frequency of the active cores.
For more information about Intel
®
Turbo Boost 2 Technology visit the Intel
®
website.
Note: Turbo Boost will only work if EIST is enabled.
Reference: http://en.wikipedia.org/wiki/Intel_Turbo_Boost
ASPM (Active State Power Management)
Active State Power Management or ASPM is a power management protocol used to manage PCI Express-based serial link
devices as links become less active over time.
As serial-based PCIe bus devices, such as IEEE1394 (FireWire), become less active, it is possible for the computer's power
management system to take the opportunity to reduce overall power consumption by placing the link PHY into a low-power
mode and instructing other devices on the link to follow suit.
Reference: http://en.wikipedia.org/wiki/Active_State_Power_Management
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