IBM Intel Xeon E7430 44E4470 Data Sheet
Product codes
44E4470
Intel® Xeon® Processor 7400 Series Datasheet
99
Thermal Specifications
order of 5 µs. During the frequency transition, the processor is unable to service any
bus requests, and consequently, all bus traffic is blocked. Edge-triggered interrupts will
be latched and kept pending until the processor resumes operation at the new
frequency.
bus requests, and consequently, all bus traffic is blocked. Edge-triggered interrupts will
be latched and kept pending until the processor resumes operation at the new
frequency.
Once the new operating frequency is engaged, the processor will transition to the new
core operating voltage by issuing a new VID code to the voltage regulator. The voltage
regulator must support dynamic VID steps in order to support Intel Thermal Monitor 2.
During the voltage change, it will be necessary to transition through multiple VID codes
to reach the target operating voltage. Each step will be one VID table entry (see
core operating voltage by issuing a new VID code to the voltage regulator. The voltage
regulator must support dynamic VID steps in order to support Intel Thermal Monitor 2.
During the voltage change, it will be necessary to transition through multiple VID codes
to reach the target operating voltage. Each step will be one VID table entry (see
). The processor continues to execute instructions during the voltage
transition. Operation at the lower voltage reduces the power consumption of the
processor.
processor.
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 operating frequency and
voltage transition back to the normal system operating point. Transition of the VID code
will occur first, in order to ensure proper operation once the processor reaches its
normal operating frequency. Refer to
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 operating frequency and
voltage transition back to the normal system operating point. Transition of the VID code
will occur first, in order to ensure proper operation once the processor reaches its
normal operating frequency. Refer to
for an illustration of this ordering.
The PROCHOT# signal is asserted when a high temperature situation is detected,
regardless of whether Intel Thermal Monitor or Intel Thermal Monitor 2 is enabled.
regardless of whether Intel Thermal Monitor or Intel Thermal Monitor 2 is enabled.
6.2.4
On-Demand Mode
The processor provides an auxiliary mechanism that allows system software to force
the processor to reduce its power consumption. This mechanism is referred to as
“On-Demand” mode and is distinct from the Intel Thermal Monitor and Intel Thermal
Monitor 2 features. On-Demand mode is intended as a means to reduce system level
power consumption. Systems utilizing the Intel® Xeon® Processor 7400 Series must
not rely on software usage of this mechanism to limit the processor temperature. If bit
4 of the IA32_CLOCK_MODULATION MSR is set to a ‘1’, the processor will immediately
reduce its power consumption via modulation (starting and stopping) of the internal
core clock, independent of the processor temperature. When using On-Demand mode,
the duty cycle of the clock modulation is programmable via bits 3:1 of the same
the processor to reduce its power consumption. This mechanism is referred to as
“On-Demand” mode and is distinct from the Intel Thermal Monitor and Intel Thermal
Monitor 2 features. On-Demand mode is intended as a means to reduce system level
power consumption. Systems utilizing the Intel® Xeon® Processor 7400 Series must
not rely on software usage of this mechanism to limit the processor temperature. If bit
4 of the IA32_CLOCK_MODULATION MSR is set to a ‘1’, the processor will immediately
reduce its power consumption via modulation (starting and stopping) of the internal
core clock, independent of the processor temperature. When using On-Demand mode,
the duty cycle of the clock modulation is programmable via bits 3:1 of the same
Figure 6-7. Intel Thermal Monitor 2 Frequency and Voltage Ordering
Vcc
Temperature
V
NOM
Frequency
Time
f
TM2
f
MAX
T
TM2
V
TM2
T(hysterisis)
Vcc
Temperature
V
NOM
Frequency
Time
f
TM2
f
MAX
T
TM2
V
TM2
T(hysterisis)