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Nehalem Turbo Mode
Frequency (F)
CoreCoreCoreCore
Description
CPU operates at higher-than-stated frequency when
operating below power and thermal design points
3 Methods
of Control
1. Off: CPU operates only at rated frequency
2. Automatic: OS requests higher perf state, CPU determines turbo
frequency (recommended)
3. Manual:
• User can manually disable cores (reboot required) via BIOS
• Less cores means more likely turbo will happen
*within power and
thermal constraints,
depends on processor
model
Core
turned off
Core
turned off
One 4-core processor
In response to workload
demand adds additional
performance bins as
cores are turned off *
Example