Intel DZ77GA-70K / DZ77RE-75K Desktop Board Performance Tuning Guide
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result in a longer time interval out of sustained mode while accumulated processor
heat is being dissipated.
3.6.1.8 Sustained Mode Power Limit
Set the Sustained Mode Power Limit (TDP) for turbo mode. If the average power
during the sustained mode time exceeds this limit, turbo mode will disengage and the
processor will run at the maximum non-turbo ratio. Inadequate cooling may cause the
processor to throttle. You can use the Intel Extreme Tuning Utility monitoring features
to track processor temperature. If the processor temperature increases steadily while
running under load, the processor cooler capability to dissipate heat is being exceeded
and you will need to reduce the TDP power limit to prevent throttling.
3.6.2 Set Multipliers (Turbo Ratios)
NOTE
Only fully unlocked or partially unlocked processors in the 3rd generation Intel Core
processor family allow modifying the multiplier (turbo ratios). See Section 3.1 for
additional details on tuning capability with the various processors.
Set the highest ratio to be used by turbo mode for each of the 1, 2, 3, and 4 core ratio
limits. The ratio multiplied by the host clock frequency determines the processor
frequency that will be obtained. Making these settings is a trial and error process. If
ratios are set too high, the processor will be unstable and will not operate. Reducing
the ratios or increasing the CPU Voltage Override (Section 3.6.1.2) and/or the TDC
Current Limit Override (Amps) (Section 3.6.1.4) can be used to restore processor
operation stability.
For the default host clock setting of 100 MHz, Table 3-1 shows the resulting processor
frequency with various multiplier values.
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