Question about Intel Core Ultra 9 frequency

[ManuelCostanzo]

Hello everyone! I have a question about the frequencies used by each type of core in the Intel Core Ultra 9 185H processor:

I understand there are P-Cores (Performance), E-Cores (Efficiency), and LP E-Cores (Low Power Efficiency). I'd like to know if the frequency drops to the lower or lowest speeds when all threads are active and performing vectorized operations. My goal is to calculate the theoretical peak GFLOPS, and for this, I need to know the operating frequency for each type of core.

Could you help me understand:

1- The base and boost frequencies for each core type (P-Cores, E-Cores, and LP E-Cores)
2- How the frequencies behave under all-core load with vectorized workloads
3- What frequencies I should use for theoretical GFLOPS calculations

Thank you very much for your help!

[NormanS_Intel]

Hello ManuelCostanzo,

Thank you for posting in the Intel Community!

1. Base and Boost Frequencies for Each Core Type:

• P-Cores (Performance Cores):

The base frequency is 2.3 GHz, and the boost frequency can go up to 5.1 GHz.

• E-Cores (Efficiency Cores):

The base frequency is 1.8 GHz, and the boost frequency can reach up to 3.8 GHz.

• LP E-Cores (Low Power Efficiency Cores):

These cores can run at up to 2.5 GHz.

2. Frequency Behavior Under All-Core Load with Vectorized Workloads:

• When all threads are active and performing vectorized operations, the frequencies of the cores may drop from their maximum boost levels to maintain thermal and power limits. The exact frequency can vary depending on the workload and cooling solution, but typically, the cores will operate at a lower frequency than their maximum boost to ensure stability and efficiency

3. Frequencies for Theoretical GFLOPS Calculations:

• For theoretical GFLOPS calculations, you should consider the typical operating frequencies under load. Values are estimates and can vary based on specific conditions and workload.

For reference, you can check the following articles:

• Where Can I Find Information about FLOPS Per Cycle for Intel® Processors?
• Is it Normal to Operate Below the Base Frequency for My Intel® Processor?
• Regulatory Information for Intel® Processors
• Export Compliance Metrics for Intel® Microprocessors
• Intel® Core™ Ultra 9 Processor 185H Specification

Best regards,
Norman S.
Intel Customer Support Engineer