Power Throttling (TDP) to 10w on Spectre x360 13t with i7-8550u

[A4Apollo]

@Secondn8ture, Thanks for your quick response again.

Thanks for sharing the pictures and details.

I did go through the pictures and your concern is TDP stays at 11% and does not increase when the CPU utilization is at 100% 

I found an article from Intel which tells you on how the TDP is calculated.

The upper point of the thermal profile consists of the Thermal Design
Power (TDP) and the associated Tcase value. Thermal Design Power (TDP) should be used for
processor thermal solution design targets. TDP is not the maximum power that the processor can
dissipate. TDP is measured at maximum TCASE.

1. The thermal profile must be adhered to to ensure
Intel’s reliability requirements are met. Note: Different processors SKU’s have different TDP’s. At the
time of this writing, Intel® Xeon® processors for 2 socket servers (5600 series) are available with a
TDP specification from 40W up to 130W depending on the particular SKU1

Due to normal manufacturing variations, the exact thermal characteristics of each individual processor
are unique. Within the specified parameters of the part, some processors may operate at a slightly
higher or lower voltage, some may dissipate slightly higher or lower power and some may draw slightly
higher or lower current. As such, no two parts have identical power and thermal characteristics.
However, the TDP specifications represent a “will not exceed” value.
- Because TDP is a worst case value when running a “worst case” application, most processors, when
running a more “typical” workload, will dissipate power that is less than the rated TDP value; how much
less will depend on the application and the specific part being tested. This is true not only for the
processor, but for every electrical component in a server.
- It is important to note that thermal design power is the maximum thermal power the processor will
dissipate, but not the same as the maximum power the processor can consume. It is possible for the
processor to consume more than the TDP power for a short period of time that isn’t “thermally
significant”. For example, a processor might consume slightly more power than the rated TDP value for
say one microsecond…but then consume less power than the rated TDP value for a long period of time.
Such operation is considered normal. Because the processor temperature does not exceed the
specified limits during such a short excursion, the processor will continue to operate correctly.

Refer this article from Intel website to know more information. Click Here

Hope this helps!

Take Care! 🙂

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[Secondn8ture]

Thank you, I understand what TDP is and as you stated, it is not the maximum power the processor can draw but rather a specification.  I have observed this as the processor pulls 30 watts for 8 to 10 seconds before throttling to 15 w for a few minutes, then down to 10 watts and stays there.  This is due to how HP has configured the system.  For some PCs there is a setting in the BIOS that lets one specify the power levels, in this case HP has hidden these settings and has set the long term power limit to 10 watts.  As this CPU has a TDP sepcification of 15 watts and the cooling is sufficient to keep temps comfortable, it should not need to be limited to 10 watts.  Throttlestop software also confirms that the long term power limit is locked at 10 watts.  HP competitors using this CPU do not have the limit set so low, hence they get more performance out of the 8550u than HP.  I would like to see this issue go to HP engineers to explain this design choice.

[Barachiel]

@Secondn8ture

It looks like you were interacting with @A4Apollo, but he is out for the day & I'll be glad to help you out, 

I'm the Barachiel & I'm at your service.

Thank you for responding,

It's great to have you back 😉

I'm sending out a Private message with the required information's,

Keep me posted,

Good Luck. 🙂

[Induna]

The power target is dynamic. What is happening is that under sustained loads the CHASSIS temperature is rising above a predetermined limit, and the power target is reduced to 10W or so until the chassis temperature drops to 70 or so, at which point the power target will slowly increase. The engineers are not going to change this. This laptop is not designed for maximum performance at 100% sustained loads. Either accept it's limitations, or get a different computer.

[elus]

Hi, i have the same problem with Power limit throttling on my hp pavilion 15-bc419ur  (i5-8250u). 
I installed last drivers and updated bios, but it throttles on 15w. Temperature is not a problem, only 64 degrees under full load.
 Intel i5-8250u specification: Configurable TDP-up : 25 W (Source). But there is no way to configurate that in Windows10. 

Can you explain my how to change Power limit. I think it can be changed by your software engineers in BIOS or Intel  Management Engine settings, but not sure. It is big problem for me, because i bought this laptop as universal device to study  everywhere(on the go) and to play computer games at home . But with Power limit 15w i can only study. Im from Belarus, so it is expensive purchase for me, hope you help me. 
Sorry for my english.

[magro007]

Is there any solution for this issue yet? I have the same issue that the CPU is limited to 10W at about 1.7 GHz while the CPU load is at maximum. The Temperature of about 70°C should allow a higher CPU clock. Intel XTU is not possible as it says the platform is not supported during installation. Performance mode in BIOS is activated.