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zalbard
Not applicable
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 2,212
Message 11 of 63

Re: All W540s have a performance throttling issue

With docked graphics setting set to "Adaptive", I am now at 3.1Ghz (under 8-thread load). That's 150Mhz faster. So that's definitely a part of the problem.

 

IGP frequency shows up at 600Mhz.

 

CPU temperatures are a few degrees lower as well.

PeterTWJ
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Posts: 1,527
Registered: ‎05-29-2010
Location: SG
Views: 2,203
Message 12 of 63

Re: All W540s have a performance throttling issue

Hi zalbard

Does the W540 BIOS have the discrete graphic options? If yes, try disabling Intel iGPU to see if the same issue occurs.

Peter

ThinkPad W520 (4284-A99) | ThinkCentre E73 SFF (10AU-0040SG) | i9300 - CM11 / GoogyMax 2

Give kudos to reward people for their assistance | Mark the thread solved if the solution works | Direct e-mail regarding technical problems will be ignored

=====================================

Dolby ; IdeaPad Slate Tablet ; Equalizer APO 

zalbard
Not applicable
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 2,193
Message 13 of 63

Re: All W540s have a performance throttling issue

I don't see any, actually.

What would be really helpful (I guess) is a BIOS option to completely disable iGPU while on AC power. That should give CPU cores some additional headroom.
maxf
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Posts: 9
Registered: ‎01-18-2014
Location: Germany
Views: 2,173
Message 14 of 63

Re: All W540s have a performance throttling issue

Just throwing in my 2 cents here:

 

Before my W540(20BG-001CGE, i7-4900mq, K2100m) bricked back in January, I did some additional testing. In my case, I set graphics to "discrete" in BIOS and ran Furmark + Prime95 in Windows 7 (green line is GPU temperature, description is unfortunately wrong):

Image on photobucket

 

So, from my point of view it seems to be a thermal issue... ;(

zalbard
Not applicable
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 2,152
Message 15 of 63

Re: All W540s have a performance throttling issue

What really surprises me is that the fan is really quiet. This makes me doubt that it ever runs at max RPM.

 

Perhaps Lenovo should allow for a more agressive fan curve.

nothrottle
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Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 2,141
Message 16 of 63

Re: All W540s have a performance throttling issue

And on that note is there any official comment from Lenovo yet? I woud have thought that a performance throttling issue in your top of the line workstation laptop series would be high on the priority list.

 

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.

 

See here for a detailed W530 stress test: http://www.thinkscopes.com/thinkpad-w530-cpugpu-stress-test-result/ 

zalbard
Not applicable
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 2,069
Message 17 of 63

Re: All W540s have a performance throttling issue

On a side note, there is another, possibly related bug.

 

Sometimes, even while on a dock with 170W PSU plugged in, the CPU gets stuck at 800Mhz.

 

Stuck.png

 

That typically happens after I've used my laptop from the battery for a while, turned it off, then plugged it into my dock and turned it on again.

 

Powering the system down solves the issue.

ColonelONeill
Not applicable
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 2,029
Message 18 of 63

Re: All W540s have a performance throttling issue

You can somewhat disable the iGPU using ThrottleStop.

In ThrottleStop, click the TPL button, check Intel Power Balance, set CPU to 31 and GPU to 0 and hit okay.

When I'm running Folding@home, this gives the CPU an extra half a multiplier at equilibrium temperatures.

This obviously reduces the amount of speed your iGPU has, which is a problem if you're using it for something like recording game footage using QuickSync.

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
PeterTWJ
Not applicable
Posts: 1,527
Registered: ‎05-29-2010
Location: SG
Views: 2,024
Message 19 of 63

Re: All W540s have a performance throttling issue

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.

Peter

ThinkPad W520 (4284-A99) | ThinkCentre E73 SFF (10AU-0040SG) | i9300 - CM11 / GoogyMax 2

Give kudos to reward people for their assistance | Mark the thread solved if the solution works | Direct e-mail regarding technical problems will be ignored

=====================================

Dolby ; IdeaPad Slate Tablet ; Equalizer APO 




jonas_hendrickx
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Posts: 1,396
Registered: ‎06-08-2013
Location: BE
Views: 2,006
Message 20 of 63

Re: All W540s have a performance throttling issue

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.

Warm regards,
Jonas Hendrickx

Lenovo Insider - Windows Insider MVP

Personal website: ThinkScopes

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