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621 Posts

07-03-2009

Andorra

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X1 Extreme UNDERCLOCK

2019-03-26, 14:52 PM

Is there any way, either in BIOS or with software, to change the CLOCK (not voltage) of the CPU on an X1 Extreme. I know if I maximize battery life the clock drops to 1 GHz from 4 GHz. But in Intel's XTU utility there is no way to change the clock.

 

I am battling excessive heat. Undervolting does work however I have had random restarts due to the "Kernel-Power" error ID 41 in Event Viewer. I don't know for a fact this error is due to the lower violtage (-0.10 offset) or if there is a system board issue.

 

Any suggestions greatly appreciated.

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111 Posts

03-01-2019

United Kingdom of Great Britain and Northern Ireland

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Re: X1 Extreme UNDERCLOCK

2019-03-26, 23:33 PM
Could you disable CPU turbo boost via the BIOS?
It's a bit alarming hearing about your issues on a current lineup machine.

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621 Posts

07-03-2009

Andorra

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Re: X1 Extreme UNDERCLOCK

2019-03-27, 12:52 PM

Turbo boost is there to increase the clock from the 4 GHZ for a short period of time. I want to decrease the clock (multiplier) so I can try 2 GHz and 3 GHz for heat control.

 

I agree it's very concerning to see a laptop constantly being thermally throttled when doing non-intensive applications. I guess I can let it burn up and then have a new motherboard installed under the warranty. But I hate to abuse any kind of equipment.

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111 Posts

03-01-2019

United Kingdom of Great Britain and Northern Ireland

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Re: X1 Extreme UNDERCLOCK

2019-03-27, 13:07 PM

This isn't something that you should have to suffer in a machine like that.

Did you buy it second hand and perhaps the previous owner had been messing with thermal paste?

 

Have you reached out to support?


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621 Posts

07-03-2009

Andorra

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Re: X1 Extreme UNDERCLOCK

2019-03-27, 14:10 PM

I will probably repaste the heatsink myself. Other than repasting, there is little support can do. I am sure every new X1E wth the i7-8750 has thermal throttling. At least "throttling" as shown on Intel's XTU app.

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24 Posts

12-02-2018

Canada

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Re: X1 Extreme UNDERCLOCK

2019-03-28, 1:33 AM

I totally recommend repasting and undervolting to help with the thermal throttling. Here are my results after a repaste: 

 

https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/Calling-P1-and-X1-Extreme-users-to-update-BIOS-1-19-fan-noise/m-p/4390697/highlight/true#M98257

 

 

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08-08-2017

Germany

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Re: X1 Extreme UNDERCLOCK

2019-03-28, 11:15 AM

Clock setting is reduced if you change processor power settings in extended power settings of Windows. Or do you need a solution for Linux?

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621 Posts

07-03-2009

Andorra

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Re: X1 Extreme UNDERCLOCK

2019-03-28, 14:12 PM

Thank you for the suggestion, markus_007. However I seem to have two conflicting settings in windows 10 Home. There is the battery icon, lower right. If that is set to either  Best Battery Life or the middle setting, the frequency drops to 1 GHz. If set to Max Performance, then I'm at 4 GHZ.

 

Using the Advanced Power Settings in Windows and setting Max Processor State when Plugged IN to 5% has no effect according to the Max Core Frequency displayed in XTU.

 

Possibly the Battery app is a Lenovo app that needs to be uninstalled for windows to control the frequency via processor power.

 

When undervolting the processor via the "Offset" by -0.10 volts in XTU, I control the temperature however there is no change in Core Frequency as shown in XTU. If lowering the voltage also lowers the core frequency, I would expect to see that revealed in XTU.

 

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111 Posts

03-01-2019

United Kingdom of Great Britain and Northern Ireland

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Re: X1 Extreme UNDERCLOCK

2019-03-28, 15:02 PM

Lowering voltage has no effect on the core frequency. Just less power (heat) to do what it needs to do. 

You can Google silicon lottery for deeper understanding.


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621 Posts

07-03-2009

Andorra

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Re: X1 Extreme UNDERCLOCK

2019-03-28, 17:18 PM

I agree and understand what you say, Hartmannson. My concern is the i7 is designed to operate at a set voltage. When undervolting you run the risk of CPU instability. However if you change the clock speed, you face no instability risk and you reduce heat. That is why I am trying to control heat from a clock standpoint, not voltage standpoint.

 

When you choose Maximum Battery Life via the battery icon (lower right) as a performance choice, the clock speed is what is changed, not the voltage, as shown in ITU. Since the battery icon appears to be a part of Windows 10, I assume there is a software path to change the clock speed, possibly through the registry. Unfortunately the advanced processor power settings via Control Panel seem to have no effect.

 

Again, thank you for your input.

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