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10 Posts

07-12-2020

Egypt

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  • Message 81 of 83

Re:y540 heat and BIOS issues

2020-07-14, 14:07 PM
sorry for the late replies it's just because the difference in time.
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10 Posts

07-12-2020

Egypt

9 Signins

70 Page Views

  • Posts: 10
  • Registered: ‎07-12-2020
  • Location: Egypt
  • Views: 70
  • Message 82 of 83

Re:y540 heat and BIOS issues

2020-07-14, 15:32 PM
btw I am not facing power limit throttling but I notice thermal throttling and this is what I found in Intel XTU.
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8 Posts

10-31-2019

Canada

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  • Message 83 of 83

Re:y540 heat and BIOS issues

2020-11-16, 2:00 AM

Best BIOS Version for the Legion Y540 with i7-9750H.

 

I’ve read a lot of forums to find out which BIOS version of Legion Y540 is the best for thermals (and performance) and on almost all cases I got 26WW and 27WW as the answer. Someone tested all the versions till 33WW or something and came to that conclusion (26WW and 27WW being the best), but I couldn’t find any recent extensive test on it. As a lot of new BIOS versions came after that, I wanted to see how they stack up in comparison, so I did the tests myself. Posting this as it might help others who are curious. I got my Y540 15IRH with i7-9750H back in August 2019 and it came pre-installed with 27WW.

 

Conclusion (if you don’t wanna read the whole thing) – BIOS 39WW (latest as of 2020 November) is as good as 26WW and 27WW so I see no reason not up update to the latest version.

 

Testing procedure –

Stress tested by running CineBench R20 on loop.

Undervolting of -1.60mV offset (on both cache and core) using ThrottleStop 9.2

High Performance mode using Vantage Software.

Constant Ambient Room temperature of 23°C 

Latest version of Windows 10 (built 20H2) and everything UpToDate with BIOS being the only variable.

 

Results - (same for all 3 BIOS Versions 26WW, 27WW and 39WW) –

Thermal limit of 95°C reached (hovering around 94°C most of the time) 

TDP limit was of 70 Watts (default in High Performance Mode) reached only initially at 4.00 GHz later was hovering around 63-67 Watts throughout the test (This was due to the temperature being the limiting factor)

Clock speed stayed around 3.65 GHz (on all cores) after initially being 4.00 GHz but dropped gradually as temperature limit of 95°C was reached.

 

I observed one thing during the testing for 10-15 seconds the TDP drops to 50 Watts and clock speed adjusts accordingly (around 3.20 GHz on all cores) then boosts back to 3.65 GHz with 70 Watts being the TDP limit again (happened on all 3 versions of BIOS).

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