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i9 9900k invisible throttle?

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chrisaern

New Member
Joined
Nov 28, 2020
Hi guys!

I have a cpu which is acting kind of strange.

Issue:
When playing CSGO I usually Set Affinity on the game and remore Core 0 and 1. This results in this constant cpu frequency(updates each second) in the console while hyper-threading is enabled.

Enabled cpu_frequency_monitoring in console:
Current CPU speed 5 GHz(game reports 150 MHz too much)
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 133.4%

After some time (10-15 minutes) when monitoring, I realize that the CPU speed is not constant any more:
~CPU Freq: 4.882 GHz Percent of requested: 135.6% Minimum percent seen: 132.4%
~CPU Freq: 4.919 GHz Percent of requested: 136.6% Minimum percent seen: 132.4%
~CPU Freq: 4.773 GHz Percent of requested: 132.5% Minimum percent seen: 132.4%
~CPU Freq: 4.773 GHz Percent of requested: 132.5% Minimum percent seen: 132.4%
~CPU Freq: 4.777 GHz Percent of requested: 132.7% Minimum percent seen: 132.4%
~CPU Freq: 5.150 GHz Percent of requested: 143.0% Minimum percent seen: 132.4%
~CPU Freq: 5.145 GHz Percent of requested: 142.9% Minimum percent seen: 132.4%
~CPU Freq: 4.773 GHz Percent of requested: 132.5% Minimum percent seen: 132.4%

I have disabled all P and C states, SpeedStep and Speedshift and all power saving features in Bios, high performance plan i Windows.

The strange thing is if I monitor the CPU with CPU-Z for example, the presumed ring ratio is correct. But doing a benchmark, show difference in performance. . I've tested this with two chips and they behave different(on different systems, as long is sufficient cooling is provided I should see a constant report of 5.150 GHz right? So it might be some other hardware/psu that's causing this. Do anyone have any idea what can cause this?

Appreciate any input.