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Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 464
Message 1 of 20

Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C / Cinebench 460max

Hi,

 

I just got a new Thinkpad X1 Yoga and I would be happy so far, if it was not for the severe thermal throttling. I checked with throttlestop and the PROCHOT (so the temperature at which the CPU thermal throttles) is set to 85C. This is far too low and should rather be 95C or 100C. Is this normal for this machine? I updated BIOS to the latest one (1.27) - no change.

 

 

unclewebb9
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Posts: 17
Registered: ‎02-20-2017
Location: CA
Views: 398
Message 2 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

The official Intel specified thermal throttling temperature for a Core i7-8650U is 100°C. 

 

https://ark.intel.com/products/124968/Intel-Core-i7-8650U-Processor-8M-Cache-up-to-4-20-GHz-

 

Unfortunately, Intel has given manufacturers the option to use an offset value.  The maximum available offset is 15°C.  This will bring the thermal throttling temperature down to 85°C.  Without a modified bios, there is no way around this problem.  My Lenovo Y510P has PROCHOT set to a much more reasonable 99°C.

 

 https://i.imgur.com/iKt9eLp.png

 

Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 372
Message 3 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

But, do other people have the same problem or is it just my computer? I downgraded the bios and same problem?! 

 

Is there a way to remove/increase the thermal limit to something more reasonable like 97 or 99C?

unclewebb9
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Posts: 17
Registered: ‎02-20-2017
Location: CA
Views: 324
Message 4 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

As I mentioned, the only way to change the thermal throttling temperature is with a bios update.  Lenovo set this to 85°C for a reason.  They must believe that the majority of their X1 Yoga customers would prefer a cool laptop over a high performance laptop.  You and I disagree with Lenovo's decision but that is not going to change anything.  

Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 321
Message 5 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

It looks like in the past for the same machine it used to be 97C, which would be way more tolerable. (https://www.reddit.com/r/thinkpad/comments/a65jfk/thermal_throttle_limit_of_x1y3_with_i7_8650u_is/). I just want to know, why they changed it to 85C. If there is no possible fix, I will return the laptop and get a Surfacebook Pro or something similar. Or get a Macbook Pro - although they do also throttle, they don't do it as aggressively and at such a low temp. It would be as easy as activating an option in the BIOS, that says HIGH PERFORMANCE MODE on/off. Raising or lowering the throttle threshold.
Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 316
Message 6 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

The Cinebench Scores I can achieve are only around 460. Which is terrible for a current gen i7!!

Untitled.png

wesleyyin
802.11n
Posts: 231
Registered: ‎07-02-2009
Location: US
Views: 284
Message 7 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

My X1 Yoga Gen 3 with the same CPU only shows 445 with power plan set to Performance.
Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 279
Message 8 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

Wow, that's slower than an i3 of the current gneration. This is just unacceptable. I would understand if this happened for operation on battery, but when plugged in, this should not be happening!

wesleyyin
802.11n
Posts: 231
Registered: ‎07-02-2009
Location: US
Views: 275
Message 9 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

Yeah. I am seriously concerned. According to https://www.notebookcheck.net/Intel-Core-i7-8650U-SoC-Benchmarks-and-Specs.242726.0.html, 8650U should have a Cinebech R15 around avg: 598.7 and median: 618.5 across 16 different models of laptop with this CPU. What I got on mine is even lower than their min at 447!! What the hell is LENOVO doing?
Sebah
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Posts: 14
Registered: ‎12-13-2018
Location: US
Views: 259
Message 10 of 20

Re: Thinkpad X1 Yoga 3rd with 8650U - Severe thermal throttling - PROCHOT set at 85C

They could fix it by allowing the CPU to go close to the 100C limit, that Intel lists. It was like that in the past. Either a BIOS update or a driver update of their power management must have changed it. 

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