03-02-2014 06:45 AM
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.
actually, I don't believe it is a thermal problem at this point, the CPU doesn't even get to 90C.
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.
03-02-2014 07:46 AM - edited 03-02-2014 07:46 AM
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.
03-02-2014 08:03 AM - edited 03-02-2014 08:04 AM
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.
03-02-2014 10:27 AM - edited 03-02-2014 10:29 AM
More testing, single-threaded this time.
Package power hovers around 27W. CPU utilisation of around 20% (XTU seems bugged).
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.
03-02-2014 03:44 PM
For me after running a stress test for 30 minutes+ with iGPU in battery saver mode:
Temps: Stable at 85 degrees
CPU: 2.7GHz. Never gets higher than this.
And yet still no comment from Lenovo....
03-02-2014 05:21 PM
03-02-2014 05:35 PM - edited 03-02-2014 05:36 PM
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.
03-02-2014 08:48 PM
03-02-2014 08:56 PM - edited 03-02-2014 08:57 PM
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.
03-03-2014 06:14 AM - edited 03-03-2014 10:29 AM
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.