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zalbard
Punch Card
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 1,536
Message 21 of 63

Re: All W540s have a performance throttling issue


@PeterTWJ wrote:

Hi zalbard

Does the TPFanControl works on W540? If yes, set the manual speed to 64 and you will get the maximum fan speed. Which helps a bit.


Hi Peter,

 

actually, I don't believe it is a thermal problem at this point, the CPU doesn't even get to 90C.


@jonas_hendrickx wrote:
I disabled Nvidia Optimus on my W530, so now I run on dedicated graphics, which helps with temperatures when both are stressed. Also it might help you with staying below the package power limit.

 I would like to be able to disable Optimus (ideally, automatically once docked or plugged in), but there's unfortunately no BIOS option for that right now.

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,528
Message 22 of 63

Re: All W540s have a performance throttling issue

Yeah, it seems like Lenovo changed the Optimus implementation, including disabling the options in BIOS.

This thread seems to indicate that you can no longer use stock NVIDIA drivers either. It's probably also no longer Linux-friendly.


W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
ibmthink
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Posts: 638
Registered: ‎10-21-2011
Location: DE
Views: 1,522
Message 23 of 63

Re: All W540s have a performance throttling issue

There is no Option to disable Optimus since Lenovo finally has the correct implementation of Optimus, which works like nVidia intended. The iGPU is standard on and also connected to the external display ports (VGA/DP/DVI/HDMI). The dGPU is just used when you need the performance.

 

The old implementation was more Linux unfriendly, since Optimus was not working correctly in Linux (using Bumblebee with the new ThinkPads should just do fine: http://bumblebee-project.org). In order to be able to connect external displays via a Dockingstation, the nVidia GPU had to be on all the time, which means the system is louder, warmer and uses much more energy. This is no longer the case with the new implemenation of Optimus.

zalbard
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Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 1,497
Message 24 of 63

Re: All W540s have a performance throttling issue

More testing, single-threaded this time.

 

Package power hovers around 27W. CPU utilisation of around 20% (XTU seems bugged).

 

ST.png

 

Not seeing full boost, either (3.6Ghz instead of 3.8 Ghz, 4900MQ).

 

Not temperature limited, not TDP limited, no GPU-intensive tasks.

 

Using 170W adapter with Ultra Dock.

 

This definitely doesn't look right.

nothrottle
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Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,472
Message 25 of 63

Re: All W540s have a performance throttling issue

For me after running a stress test for 30 minutes+ with iGPU in battery saver mode:

 

iGPU: 600MHz

Fan: 3000rpm

Temps: Stable at 85 degrees

 

CPU: 2.7GHz. Never gets higher than this.

 

And yet still no comment from Lenovo....

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,455
Message 26 of 63

Re: All W540s have a performance throttling issue

I don't think the CPU will give you full turbo at 85 degrees.

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,451
Message 27 of 63

Re: All W540s have a performance throttling issue

And just to be clear I understand that I should not expect full turbo. It's that its not giving me *any* turbo.

As I stated above somewhere, based on how the W530 was able to perform in similar tests I would expect my W540 to be able to turbo boost to 3.4GHz.

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,435
Message 28 of 63

Re: All W540s have a performance throttling issue

Which CPU do you have?

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,432
Message 29 of 63

Re: All W540s have a performance throttling issue

i7-4800MQ. Tuirbo boost is enabled, and it will briefly get up to 3.4GHz for about 5 seconds before dropping down again. For more info, here's my post from earlier in the thread:

 

To make things more frustrating from what I have read in other reviews the older W530 was a much better performer, and was able to stay within 100MHz of its max turbo speed when running CPU only full loads. To put it in perspective, a W530 with slower i7-3720QM could turbo boost to 3.3GHz when running Prime95. My W540 with faster i7-4800MQ can only do 2.7GHz in the same test.

zalbard
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Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 1,393
Message 30 of 63

Re: All W540s have a performance throttling issue

What's also disappointing is that Lenovo did something with Intel XTU, so settings do not stick after a reboot. Thus any manual tweaking is out of our hands...

 

Edit: Could someone from Lenovo actually look into why Intel XTU settings do not stick after rebooting? That would be great, thanks.

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