cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,700
Message 31 of 63

Re: All W540s have a performance throttling issue

Given the apparent complete lack of interest by Lenovo in this issue, I have returned my W540 for a full refund on the grounds that it does not meet the advertised capabilities of being a workstation laptop.

I shall be purchasing a Dell Precision M4800, and when my unit arrives I will be sure to post to these boards with a comparison of throttling performance versus the W540.
zalbard
Punch Card
Posts: 55
Registered: ‎12-25-2013
Location: Germany
Views: 1,664
Message 32 of 63

Re: All W540s have a performance throttling issue


@zalbard wrote:

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.

 

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.


Happened to me again, the cause seems to be the same - low battery level while being docked.

 

Rebooting doesn't help - completely shutting down does. Could be a Win8.1 issue, perhaps.

olakiril
Punch Card
Posts: 36
Registered: ‎12-22-2013
Location: United States
Views: 1,642
Message 33 of 63

Re: All W540s have a performance throttling issue


@nothrottle wrote:
Given the apparent complete lack of interest by Lenovo in this issue, I have returned my W540 for a full refund on the grounds that it does not meet the advertised capabilities of being a workstation laptop.

I shall be purchasing a Dell Precision M4800, and when my unit arrives I will be sure to post to these boards with a comparison of throttling performance versus the W540.

Throttling was one of the many reasons I returned mine a couple of weeks ago too. 

I got an HP 8770w and I cannot believe how the w540 can be discribed as "workstation".

 

Bauden
Token Ring
Posts: 513
Registered: ‎02-24-2014
Location: AF
Views: 1,631
Message 34 of 63

Re: All W540s have a performance throttling issue

Dunno, but I could not return mine, without a restocking fee of 20%, or $460!!!!  Problem is that the unit is not on display for a hands on trial.

 

I had to buy a box, and take it home.  Once opened, I was stuck!  In any event, I posted my impartial factual review on the site as a warning on what to expect.  Life goes on.  Now my unit is on sale on Craigs list.  Even if I loose that $460 on CL sale, I'll be better off!

nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,600
Message 35 of 63

Re: All W540s have a performance throttling issue

Notebook check has its W540 review up.

 

http://www.notebookcheck.net/Review-Lenovo-ThinkPad-W540-Workstation.112318.0.html

 

Interestingly while they found some throttling issues, they were not as bad as is being reported in this thread. I wonder if thats because they are using a lower spec i7-4700MQ. Ironically the lower spec system outperformed my higher spec i7-4800MQ because it didnt throrttle as badly as my system did.

 

Weird.

Bauden
Token Ring
Posts: 513
Registered: ‎02-24-2014
Location: AF
Views: 1,483
Message 36 of 63

Re: All W540s have a performance throttling issue

I'm a tad confused. My W540 with an i7 4800MQ, CPU-Z reports 3496.71 MHz with a bus speed of 99.78.

Someone suggeted in the previous message's link that this solved the throttling issue.  Is my system slow? Should it be higher, ~3600+

 

>> ... own a W540, and believe it or not - I love it! It's light, fast (CPU throttling was fixed by first uninstalling (important!) the NVIDIA driver, reboot, set gfx switching mode in BIOS to advanced, and reinstalling with the latest NVIDIA driver from NVIDIA's website - boom - no more throttling when using the NVIDIA graphics. ...<

 

OK, so I d/l'ed the latest driver from NVIDIA v 332.50.  Should I perform this procedure???

nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,479
Message 37 of 63

Re: All W540s have a performance throttling issue

Throttling is only measureable when the CPU is running at full load.... I would guess that the 3496.71 MHz you are seeing is when the CPU is not being loaded fully? The common way to do that which most reviews use is to run Prime95, which runs mathematical operatoins on all cores simultanesouly.

 

Thats the first I have heard of nVidia drivers fixing CPU throttling. Would be curious if anyone else on this thread who reported throttling was able to fix it with new nVidia drivers.

 

Bauden
Token Ring
Posts: 513
Registered: ‎02-24-2014
Location: AF
Views: 1,469
Message 38 of 63

Re: All W540s have a performance throttling issue

Thank you for the info.  Ran Prime95 v27.9.1.0 with CPU-Z did it for about 5 minutes, most of the time it stayed at 3.4+ then dropped for 0.5-1 second to 2697, but jumped right back to 3495.  I did not adjust anything in the BIOS.

 

I need to check on the meaning of this.

nothrottle
Fanfold Paper
Posts: 17
Registered: ‎02-10-2014
Location: Australia
Views: 1,453
Message 39 of 63

Re: All W540s have a performance throttling issue

Hrm thats an interesting result as your W540 is achieving the maximum theoretical turbo boost possible... I have never heard of any laptop being able to do that, and especially not the W540 as per other users results in this thread. When you are running prime 95 if you bring up task manager performance tab, does it show all 8 cores at 100% usage like this?

 

Capture.JPG

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 1,416
Message 40 of 63

Re: All W540s have a performance throttling issue

I think IntelBurnTest is better at pushing the CPU than Prime95.

If it throttles on CPU only tasks, I'd hate to see what happens when you pair it with Furmark.

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

Check out current deals!


Shop current deals

Top Kudoed Authors