IBM Intel Xeon E7430 44E4470 Data Sheet
Product codes
44E4470
Thermal Specifications
98
Intel® Xeon® Processor 7400 Series Datasheet
is not software visible. Bus traffic is snooped in the normal manner, and interrupt
requests are latched (and serviced during the time that the clocks are on) while the
TCC is active.
requests are latched (and serviced during the time that the clocks are on) while the
TCC is active.
When the Intel Thermal Monitor is enabled, and a high temperature situation exists
(that is, TCC is active), the clocks will be modulated by alternately turning the clocks
off and on at a duty cycle specific to the processor (typically 30 - 50%). Cycle times are
processor speed dependent and will decrease as processor core frequencies increase. A
small amount of hysteresis has been included to prevent rapid active/inactive
transitions of the TCC when the processor temperature is near its maximum operating
temperature. Once the temperature has dropped below the maximum operating
temperature, and the hysteresis timer has expired, the TCC goes inactive and clock
modulation ceases.
(that is, TCC is active), the clocks will be modulated by alternately turning the clocks
off and on at a duty cycle specific to the processor (typically 30 - 50%). Cycle times are
processor speed dependent and will decrease as processor core frequencies increase. A
small amount of hysteresis has been included to prevent rapid active/inactive
transitions of the TCC when the processor temperature is near its maximum operating
temperature. Once the temperature has dropped below the maximum operating
temperature, and the hysteresis timer has expired, the TCC goes inactive and clock
modulation ceases.
With a thermal solution designed to meet the Intel® Xeon® Processor 7400 Series
Thermal Profiles, it is anticipated that the TCC would only be activated for very short
periods of time when running the most power intensive applications. The processor
performance impact due to these brief periods of TCC activation is expected to be so
minor that it would be immeasurable. In addition, a thermal solution that is
significantly under designed may not be capable of cooling the processor even when
the TCC is active continuously. Refer to the Intel® Xeon® Processor 7400 Series
Thermal Mechanical Design Guide or information on designing a thermal solution.
Thermal Profiles, it is anticipated that the TCC would only be activated for very short
periods of time when running the most power intensive applications. The processor
performance impact due to these brief periods of TCC activation is expected to be so
minor that it would be immeasurable. In addition, a thermal solution that is
significantly under designed may not be capable of cooling the processor even when
the TCC is active continuously. Refer to the Intel® Xeon® Processor 7400 Series
Thermal Mechanical Design Guide or information on designing a thermal solution.
The duty cycle for the TCC, when activated by the Intel Thermal Monitor, is factory
configured and cannot be modified. The Thermal Monitor does not require any
additional hardware, software drivers, or interrupt handling routines.
configured and cannot be modified. The Thermal Monitor does not require any
additional hardware, software drivers, or interrupt handling routines.
6.2.3
Intel Thermal Monitor 2
The Intel® Xeon® Processor 7400 Series adds supports for an Enhanced Thermal
Monitor capability known as Intel Thermal Monitor 2 (TM2). This mechanism provides
an efficient means for limiting the processor temperature by reducing the power
consumption within the processor. The Intel Thermal Monitor or Enhanced Thermal
Monitor must be enabled for the processor to be operating within specifications. TM2
requires support for dynamic VID transitions in the platform.
Monitor capability known as Intel Thermal Monitor 2 (TM2). This mechanism provides
an efficient means for limiting the processor temperature by reducing the power
consumption within the processor. The Intel Thermal Monitor or Enhanced Thermal
Monitor must be enabled for the processor to be operating within specifications. TM2
requires support for dynamic VID transitions in the platform.
Note:
Not all Intel® Xeon® Processor 7400 Series are capable of supporting TM2. More detail
on which processor frequencies will support TM2 will be provided in future releases of
the Intel® Xeon® Processor 7400 Series Specification Update when available.
When Intel Thermal Monitor 2 is enabled, and a high temperature situation is detected,
the Thermal Control Circuit (TCC) will be activated for all processor cores. The TCC
causes the processor to adjust its operating frequency (via the bus multiplier) and
input voltage (via the VID signals). This combination of reduced frequency and VID
results in a reduction to the processor power consumption.
the Thermal Control Circuit (TCC) will be activated for all processor cores. The TCC
causes the processor to adjust its operating frequency (via the bus multiplier) and
input voltage (via the VID signals). This combination of reduced frequency and VID
results in a reduction to the processor power consumption.
A processor enabled for Intel Thermal Monitor 2 includes two operating points, each
consisting of a specific operating frequency and voltage, which is identical for both
processor dies. The first operating point represents the normal operating condition for
the processor. Under this condition, the core-frequency-to-system-bus multiplier
utilized by the processor is that contained in the CLOCK_FLEX_MAX MSR and the VID
that is specified in
consisting of a specific operating frequency and voltage, which is identical for both
processor dies. The first operating point represents the normal operating condition for
the processor. Under this condition, the core-frequency-to-system-bus multiplier
utilized by the processor is that contained in the CLOCK_FLEX_MAX MSR and the VID
that is specified in
The second operating point consists of both a lower operating frequency and voltage.
The lowest operating frequency is determined by the lowest supported bus ratio (1/8
for the Intel® Xeon® Processor 7400 Series). When the TCC is activated, the processor
automatically transitions to the new frequency. This transition occurs rapidly, on the
The lowest operating frequency is determined by the lowest supported bus ratio (1/8
for the Intel® Xeon® Processor 7400 Series). When the TCC is activated, the processor
automatically transitions to the new frequency. This transition occurs rapidly, on the