Is there any way to explicitly control Intel SpeedShift EPP in Windows 11?

I have an issue: enabling SpeedShift on my motherboard results in terrible performance because it appears Windows, regardless of power plan, sets a very conservative EPP value. I've attempted using "Balanced" and "Performance" power plans to push performance higher, and I've also tried using the "Processor Energy Performance Preference Policy" to attempt to bias the CPU more towards readily clocking up, but I've had no success with it.

The SpeedShift register is clearly accessible from Windows, as ThrottleStop is able to modify it and the difference is immediately obvious. ThrottleStop, unfortunately, isn't an option for a solution because running it overwrites the AVX512 offset my CPU uses, which causes my system to become unstable.

Is there any known way to control this register from a Windows 11 setting? I'd like to be able to use SpeedShift since it is more responsive than traditional P-states, but it isn't really functional to me if it is so biased against performance in Windows.

when you say tried using the “Processor Energy Performance Preference Policy” without success, exactly how did you do that? Through the hidden power plan registry item? There are a number related to SpeedShift. I have exposed a number of these in my power plans. I can send you the .reg files to expose/hide them in the power plan app if you wish. Through this means I have adjusted the EPP to a more performant value and verified the performance improvement.

geneo said:

when you say tried using the “Processor Energy Performance Preference Policy” without success, exactly how did you do that? Through the hidden power plan registry item? There are a number related to SpeedShift. I have exposed a number of these in my power plans. I can send you the .reg files to expose/hide them in the power plan app if you wish. Through this means I have adjusted the EPP to a more performant value and verified the performance improvement.

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Sure, I'm up for trying that. I exposed it using the setting in the registry. I had also attempted to tune some parameters using powercfg. I'm open to exposing more via registry.

Mind also including which ones seem to affect SpeedShift?

I believe I have only changed EPP. I have it set to 23%. Anyhow, this makes it easier to play with and you can do it per power plan (if yoou do this in the registry you have to figure in which power plan). BTW, Microsoft calls speedshift "autonomous mode" so those settings in the registry that have "autonomous mode" in their description are specifically for speed shift. Also, since these are per power profile

I haven't looked at this for a while.

pantsaregood said:

Sure, I'm up for trying that. I exposed it using the setting in the registry. I had also attempted to tune some parameters using powercfg. I'm open to exposing more via registry.

Mind also including which ones seem to affect SpeedShift?

Click to expand...

Any luck?