03-06-2014 07:35 PM
03-07-2014 05:21 AM - edited 03-07-2014 05:46 AM
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.
03-07-2014 06:53 AM
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".
03-07-2014 08:03 AM
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!
03-07-2014 05:33 PM
Notebook check has its W540 review up.
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.
03-11-2014 10:00 PM - edited 03-11-2014 10:02 PM
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???
03-11-2014 10:23 PM
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.
03-11-2014 11:33 PM
Thank you for the info. Ran Prime95 v18.104.22.168 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.
03-12-2014 02:16 AM
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?
03-12-2014 08:31 AM