• 03/25/2021
  • Public Content

Active Power and Speed Shift

While in active states, the processor and the operating system jointly decide frequencies for various parts of the system (CPUs, GPU, and memory ring, in particular). The current generation of Intel Core processors add more interaction between the operating system and the processor(s) to respond more efficiently and quickly to changes in power demand—a process referred to as Intel® Speed Shift Technology.
The system balances the frequencies based on activity and increases frequency (and thus consumed power) where it is needed most. As a result, a mostly active workload may have its GPU and CPU balance frequencies based on power consumption.
Reducing the amount of work done on the CPU can free up power for the GPU and vice versa. This can result in better overall performance, even when the other side was the primary performance bottleneck.
Tools such as Intel® Power Gadget can also help you see the frequencies of each clock domain in real time. You can monitor the frequencies of different subsystems on target devices by running this tool.
You can tell that your app’s power distribution is getting balanced when the primary performance bottleneck is not running at full frequency, but power consumption is reaching the maximum limits available.

Product and Performance Information


Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.