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7 Posts

01-02-2017

Czech Republic

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Re:T490 MX250 Throttling Problem

2021-05-06, 13:30 PM

One picture is more than thousand words. 

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387 Posts

09-04-2019

United States of America

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Re:T490 MX250 Throttling Problem

2021-05-06, 18:45 PM
You can use Belarc Advisor to get the serial number and see if that has any meaning. Physically on the board there could be a revision number, if applicable not Belarc doesn't track it if it exists.
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387 Posts

09-04-2019

United States of America

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Re:T490 MX250 Throttling Problem

2021-05-06, 18:46 PM
1.72 works well. I don't see why you won't use it.
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7 Posts

01-02-2017

Czech Republic

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Re:T490 MX250 Throttling Problem

2021-05-06, 20:01 PM

Well my machine is throttling ALL THE TIME when MX250 is active, even if running fresh stock Windows with only drivers installed and NO LOAD. 
It need some serious tinkering following Hayaku's instructions here on page 20 to be barely able to play anything but even then it throttles in 5-15minutes no matter what because I am not able to undervolt GPU and fix its MHz due the newer BIOS limitations.

At this point my good old T440p, 4800MQ, GT730M ang 16Gigs is abslutely beast... it's fan sounds like its about to take off but it doesnt throttle what so ever, even under heavy load.

Belarc doesnt tell me much, boards serial number starts L1 but there is no REV. marking on it. 
Hope new MB will solve this, anyway for me its definitive: After T400, T410, T420, T430s, T440, is clear that modern Thinkpads are not of same pedigree.
For me the last great Thinkpad stays my faithful, beaten but still strong T440p.

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37 Posts

09-19-2019

Denmark

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Re:T490 MX250 Throttling Problem

2021-05-06, 23:25 PM

This is a combination of a bunch of different issues. One of them is, that the cooling solution is pretty much incapable of cooling down the dGPU to 56 degrees C, unless you let the fan scream. It has too high consumption even when manually set to the lowest possible voltage. Another one is very boor battery cooling - it heats up from the motherboard and it reaches the manufacturer's charging limit of 45 deg C way too easily. And ofc poor heat transfer from the bottom of the laptop - another reason for the temperature limitation.

I sort of learned to deal with it, but that is thanks to the BIOS 1.53 + full CPU control + repaste + undervolt + custom fan curve + external cooling when using dGPU . The only time I use GPU is while gaming in Windows (CPU limited to 2,5-3Ghz). In Linux, I did not manage to get past the 56 deg C limitation, which makes the dGPU useless, so I keep it disabled. Oh, and you need some special kernel command to do that as well (because there is a PSU with some weird control for the dGPU).

Atm I am actually running my T490 fully passively cooled in most cases. I simply set up the CPU throttling to 56 deg C + 11W TDP short term / 8W TDP Long term, undervolted by 110mV and disable the fan. It works pretty well, runs super quiet while doing all tasks, keeps safe temperatures and still provides higher performance than 6th-7th gen dual cores.  It can keep 5,5W-6W CPU TDP in room temperature forever. There is at least one advantage compared to the non-dGPU version - you get a better heatsink.

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387 Posts

09-04-2019

United States of America

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Re:T490 MX250 Throttling Problem

2021-05-07, 7:58 AM

P43s here, same architecture and casing as a T490. What helps is getting an elevated laptop cooler with fans underneath. The fans wont ever be needed but just in case. Letting the low profile laptop have space to ventilate underneath does wonders. Prior to the elevation laptop cooler, my P43s fans would kick in during the Summer with no AC on. With the cooler, it disappeared.

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6 Posts

08-11-2020

Slovenia

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Re:T490 MX250 Throttling Problem

2021-07-12, 17:28 PM

This problem was also detected on https://www.notebookcheck.net/Lenovo-ThinkPad-T590-business-laptop-review-Large-lightweight-but-bad-screen.427023.0.html under temperature section:

 

In the stress test with Prime95 and FurMark, it becomes clear that the ThinkPad T590 as a comparably slim and light office laptop is not made for continuous load. At the start of the stress test, the CPU can consume 17 W, with a short boost to 25 W. This means that the CPU clock-rate reaches 2.7 GHz. After five minutes, the consumption and clock-rate rapidly fall, until the CPU just consumes 5 W, which results in clock-rates of just 400 MHz. The GPU cannot keep up its maximum clock-rate either. After 15 minutes, the clock-rate sits at 800 MHz. Both CPU and GPU temperatures stay pretty low after the first few minutes of the stress test, so both the main and the graphical processors should be able to raise their clock-rates. This does not happen.

Interestingly, the CPU performance stays throttled long after the stress test is over, while the GPU is able to reach is normal performance level again. In the 3DMark 11, the throttled CPU performance results in a lower physics score. A reboot solves this problem, which seems something that Lenovo should fix with a driver or BIOS update.

 

 

This laptop is bad by design!

 

 

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1 Posts

07-31-2021

Turkey

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  • Message 258 of 258

Re:T490 MX250 Throttling Problem

2021-07-31, 12:42 PM

BIOS downgrade to 1.5X not permitted with newer bioses. Can you share with us your BIOS dump which read from eeprom programmer?

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