Intel S1155 User Manual download pdf (Page 58)

Thermal Specifications

58 Thermal/Mechanical Specifications and Design Guidelines

transitioning to the minimum frequency and corresponding voltage (using Freq/VID

control). Clock modulation is not activated in this case. The TCC will remain active until

the system de-asserts PROCHOT#.

Use of PROCHOT# in bi-directional mode can allow VR thermal designs to target

maximum sustained current instead of maximum current. Systems should still provide

proper cooling for the VR, and rely on PROCHOT# only as a backup in case of system

cooling failure. The system thermal design should allow the power delivery circuitry to

operate within its temperature specification even while the processor is operating at its

Thermal Design Power.

6.2.3 THERMTRIP# Signal

Regardless of whether or not Adaptive Thermal Monitor is enabled, in the event of a

catastrophic cooling failure, the processor will automatically shut down when the silicon

has reached an elevated temperature (refer to the THERMTRIP# definition in the EDS).

At this point, the THERMTRIP# signal will go active and stay active as described in the

EDS. THERMTRIP# activation is independent of processor activity. If THERMTRIP# is

asserted, processor core voltage (V

) must be removed within the timeframe defined

in EDS. The temperature at which THERMTRIP# asserts is not user configurable and is

not software visible.

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:

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Intel S1155 User Manual Page 58

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