Thermal/Mechanical Specifications and Design Guidelines
57
Thermal Specifications
6.3
Intel
®
Turbo Boost Technology
Intel
®
Turbo Boost Technology is a feature that allows the processor to
opportunistically and automatically run faster than its rated operating core and/or
render clock frequency when there is sufficient power headroom, and the product is
within specified temperature and current limits. The Intel
®
Turbo Boost Technology
feature is designed to increase performance of both multi-threaded and single-
threaded workloads. The processor supports a Turbo mode where the processor can
utilize the thermal capacitance associated with the package and run at power levels
higher than TDP power for short durations. This improves the system responsiveness
for short, bursty usage conditions. The turbo feature needs to be properly enabled by
BIOS for the processor to operate with maximum performance. Since the turbo feature
is configurable and dependent on many platform design limits outside of the processor
control, the maximum performance cannot be guaranteed.
Turbo Mode availability is independent of the number of active cores; however, the
Turbo Mode frequency is dynamic and dependent on the instantaneous application
power load, the number of active cores, user configurable settings, operating
environment and system design. Intel
®
Turbo Boost Technology may not be available
on all SKUs.
6.3.1
Intel
®
Turbo Boost Technology Frequency
The processor’s rated frequency assumes that all execution cores are running an
application at the Thermal Design Power (TDP). However, under typical operation, not
all cores are active. Therefore most applications are consuming less than the TDP at the
rated frequency. To take advantage of the available TDP headroom, the active cores can
increase their operating frequency.
To determine the highest performance frequency amongst active cores, the processor
takes the following into consideration:
• The number of cores operating in the C0 state.
• The estimated current consumption.
• The estimated power consumption.
• The temperature.
Any of these factors can affect the maximum frequency for a given workload. If the
power, current, or thermal limit is reached, the processor will automatically reduce the
frequency to stay with its TDP limit.
Note:
Intel Turbo Boost Technology processor frequencies are only active if the operating
system is requesting the P0 state.
6.3.2
Intel
®
Turbo Boost Technology Graphics Frequency
Graphics render frequency is selected by the processor dynamically based on the
graphics workload demand. The processor can optimize both processor and integrated
graphics performance through managing total package power. For the integrated
graphics, this could mean an increase in the render core frequency (above its base
frequency) and increased graphics performance. In addition, the processor core can
increase its frequency higher than it would without power sharing.
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