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Dynamic Frequency enabled processors will offer a range of upside performance
capability beyond their rated or guaranteed frequency.
•
Controls the processor core and internal graphics controller Intel Turbo Boost
performance states to ensure that overall MCP thermal power consumption does
not exceed the specified MCP thermal power limit.
•
Limits MCP component usage to ensure that each of the components' T
not exceeded.
It is possible that the thermal influence between the MCP components could potentially
cause a component to reach its T
throttling. It is expected that when running the TDP workload, power sharing control
may limit the entire range of component Intel Turbo Boost capabilities (effectively,
disabling them).
The principal component of the power sharing control architecture is the policy
manager within the Intel Turbo Boost Technology driver which:
•
Communicates with the graphics software driver to limit, or increase, internal
graphics thermal power.
•
Communicates with the processor core via the PCH to processor core PECI interface
to limit, or increase, processor core thermal power.
The Intel Turbo Boost Technology policy manager will set a thermal power limit to
which the graphics driver and processor core will adjust their Intel Turbo Boost
Technology performance dynamically, to stay within the limit.
Note:
The processor PECI pin must be connected to the PCH PECI pin in order for Intel Turbo
Boost Technology to properly function.
5.1.5
Component Power Measurement/Estimation Error
The processor input pin (ISENSE) informs the processor core of how much amperage
the processor core is consuming. This information is provided by the processor core VR.
The process will calculate its current power based upon the ISENSE input information
and current voltage state. The internal graphics and memory controller power is
estimated by the GFX driver using PMON.
Any error in power estimation or measurement may limit or completely eliminate the
performance benefit of Intel Turbo Boost Technology. When a power limit is reached,
Power sharing control will adaptively remove Intel Turbo Boost Technology states to
remain with the MCP thermal power limit. Power sharing control assumes the power
error is always accurate so if the ISENSE input reports power greater than the actual
power, control mechanisms will lower performance before the actual TDP power limit is
reached. Intelligent Power sharing will provide better overall Intel Turbo Boost
Technology performance with increasing VR current sense accuracy. Designers and
system manufacturers should study trade-offs on VR component accuracy
characteristics, such as inductors, to find the best balance of cost vs. performance for
their system price and performance targets.
56
, invoking undesirable component hardware auto-
j,max
Thermal Management
value is
j,max
Datasheet
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