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100 Posts

08-25-2018

CN

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Re: T480 TDP throttle

2019-12-06, 4:27 AM

It is a completely unacceptable compromise to buy a business grade laptop for 1700$ and have to disable HALF of it to get even just the CPUto run without it throttling. 

 

Imagine doing CAD, render, or video editing work on a laptop that was meant for that, but can't achieve more than a sandy bridge desktop chip.  

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31 Posts

10-13-2015

US

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Re: T480 TDP throttle

2019-12-07, 2:01 AM

I agree, the thermal design of the T480 is bad - not at all what we paid for and certainly not what I expected from a higher-end laptop. Running at half speed while docked is pathetic. 

 

Does anyone know of a laptop with well-design thermal control?

 

For what it's worth, Apple's new Macbook Pro 16" is getting good reviews for its heat management, showing very little throttling under full load. Combined with a much-improved keyboard, it tempts me to make the switch to MacOS if Lenovo doesn't fix the T480 in the next few months. 

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2 Posts

08-16-2019

DE

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  • Message 43 of 51

Re: T480 TDP throttle

2020-01-20, 13:04 PM

I had some time and did some testing. I doubt that this problem has something to do with the CPU/GPU cooling or at least not alone.

I still believe that the Phase Changer for the CPU/GPU are way to undersized for its power drawing. So they start to throttle because of overheating.

I changed the cooling and regardless how cold i got the cpu/gpu it startet to throtle. I'm waiting now for some parts i ordered. Then i post an Update. (i try to cool the PLs seperatly without touching CPU/GPU)

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31 Posts

10-13-2015

US

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Re:T480 TDP throttle

2020-02-28, 1:42 AM

The problem persists, and I've tried just about everything. 

 

I've been in constant contact with Lenovo (they've replaced the motherboard twice), I'm running Throttlestop and monitoring the CPU temperature religiously, but the problem persists. I've tried every permutation of all the layers of power management on the T480 (both Microsoft's and Lenovo's). Something very basic is wrong with the T480 thermal design or monitoring. 

 

But I found a solution - I bought a Macbook Pro 16". 

 

After 25 years, I'm done with buying any more Thinkpads. I know Apple has had problems with their Macbooks in the past few years, but the 16" Pro seems to have fixed many sins. So far it's been rock solid. I'll keep my Thinkpads around for light tasks like text editing. Life's to short for unreliable tools. 

 

Good luck!

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113 Posts

05-17-2019

US

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Re:T480 TDP throttle

2020-02-29, 13:14 PM

just have a look

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17 Posts

06-18-2016

IL

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  • Message 46 of 51

Re:T480 TDP throttle

2020-04-22, 15:57 PM

I have the same problem. 

 

When the PC is docked in the ThinkPad Ultra Docking Station, I have to place a fan at the ventilation opening or else the CPU is throttled. Temperatures are normal.

Also, as soon as I start using the GPU, even with this external fan. the CPU is throttled.


 

When I start a computer game using the GPU, my CPU goes down to 0.99 Ghz or slower.

(Without the fan, it throttles even without the GPU being used)
 

 

Is it a product design defect?

Should my PC be serviced?

 

Best,

Mickey

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17 Posts

06-18-2016

IL

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  • Message 47 of 51

Re:T480 TDP throttle

2020-04-22, 16:25 PM

I tried lowering CPU voltage by 120mv and Intel's GPU by 50mV with Intel's XTU and It caused a BSOD when I started a computer game that heavily uses the GPU.

It throttled down to 1.6GHz and then at some point it died.

 

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17 Posts

06-18-2016

IL

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  • Message 48 of 51

Re:T480 TDP throttle

2020-04-25, 18:25 PM

Ok,

 

For now I think I have a some direction:

Used intel's XPU to set CPU under-voltage to -120mv, GPU under-voltage to -50mv, 

Set Turbo Boost Power Max from 15W to 17W.

Set Boost Short Power Max from 15W to 22W.

 

Install TPFanControl that can speed up the internal fan when temperature rises. For some reason the Lenovo drivers do not do it.

 

Note: Installing Inte's XTU is tricky. Use this procedure: https://kallelilja.com/2018/12/workaround-xtu-attempted-to-install-on-an-unsupported-platform/

 

Use HWiNFO64 to monitor things. You may see momentary high temperatures. Throttling may still happen but much less.

 

I do have an external fan at the ventilation fins when I really stress the PC.

 

No need to say that Lenovo's power management SUCKS.

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1 Posts

06-05-2020

US

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  • Message 49 of 51

Re:T480 TDP throttle

2020-06-05, 23:14 PM

@ menglm wrote:
 

 

just have a look

 

Anything to update us? The Thinkpad was meant for business use, now my laptop can't just do simple code compiling as the PL will keep on throttling the CPU clock to be 0.2~0.4GHz! 

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89 Posts

01-19-2020

CH

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  • Message 50 of 51

Re:T480 TDP throttle

2020-06-07, 1:04 AM

I have a T480 with the I7 8550U CPU, without the 150MX Nvidia GPU, but for every heavy task it goes hot very quickly. At a certain point the sound of the speaker goes very bad. and every task get so so slow .. but after killink the heavy process .... and a short period of time ... Everything goes back to normal.  I'm serously thinking reading your comments... the T480 might have a cooler design problem even without th Nvidia GPU... 

 

Considering the same heatpipe and fan should cool the CPU and THe GPU, and considering, to cool just the CPU it  doesn't work well, I'm not surprised about the throttle problems with the GPU Chip.

 

One good thing is the noise of the fan is never a problem ... i can hear it clearely only if i lauch TPfanControl at the max values (7)..... but then i can run heavy task for a reasonable period of time without throttle problems ... 

 

Do you know if the T490 or more recently the t14 have the same issues ?

 

 

 

If a post answers your question, please mark it as an”Accepted Solution“! If a post helps you, please click the star to give it a "Kudo"! T40P, T43, T60, T410, T420S, T450S, T480, T14 Gen1 ... Always Thinkpad. I don't work for Lenovo, I just like Thinkpads and try to help...
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