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Alef
Blue Screen Again
Posts: 3
Registered: ‎01-14-2015
Location: Canada
Views: 539
Message 1 of 5

Nivdia Optimus Issues

While on battery my cpu runs at 1ghz with Nivdia Optimus mode selected in bios. Even if the gpu is idle/off cpu is still at 1ghz. But if I switch to just intergraded graphics in bios my cpu can turbo to 3.4ghz which leads me to believe something is wrong with Nivdia Optimus. Question is how do I fully utilize my cpu with Nivdia Optimus mode enabled.

W520 | 2760QM | 12GB RAM | Quadro 1000M | 500GB 7200RPM HDD | Intel 330 120GB SSD in Ultrabay
Shawn3090
802.11n
Posts: 276
Registered: ‎10-26-2010
Location: US
Views: 496
Message 2 of 5

Re: Nivdia Optimus Issues

You can't. The CPU is throttled while the Nvidia GPU is on because otherwise you would have too much power draw from the battery. You can see this by leaving Optimus mode on, but not using any 3D applications and observe that the CPU reaches full speed on battery.


W540: i7-4700mq, K2100m, 16 GB RAM, 500 GB Samsung 840 EVO
T510: i7-620m, NVS 3100m, 8 GB RAM, 500 GB Samsung 840 EVO
Alef
Blue Screen Again
Posts: 3
Registered: ‎01-14-2015
Location: Canada
Views: 488
Message 3 of 5

Re: Nivdia Optimus Issues

The thing is even when not using any 3D applications its still at 1ghz
W520 | 2760QM | 12GB RAM | Quadro 1000M | 500GB 7200RPM HDD | Intel 330 120GB SSD in Ultrabay
SeniorGuru
Posts: 2,320
Registered: ‎06-13-2013
Location: US
Views: 480
Message 4 of 5

Re: Nivdia Optimus Issues

What happens if you disable Optimus in the BIOS, and select "discrete graphics" (as I'm guessing is available in your W520 as it is in my W530).  This should eliminate Optimus and revert to 100% use of the K1000M (and should also allow you to install the latest nVidia retail graphics driver 340.21, presumably).

 

Do you now see the CPU throttling as well?  Any reason you just don't use the K1000M all the time (especially if you're plugged into power)?  Even if on battery you surely have some hours of usable lifetime, if you can't get to a charger until later.

 

Have you experimented both plugged into power as well as on battery?  What are the differences in performance, if any?

Alef
Blue Screen Again
Posts: 3
Registered: ‎01-14-2015
Location: Canada
Views: 464
Message 5 of 5

Re: Nivdia Optimus Issues

With discrete graphics selected in the BIOS the CPU runs at 1Ghz on battery. While plugged in no throttling is occuring. This is with graphics driver 341.21.

I would prefer not to use the 1000M all the time as some of the things I do are cpu intensive. As Shawn3090 point out there would be to much power draw run both under heavy load on battery which is why I want to get Optimus working. Battery run time is no issue to me, if I get at least an hour I am happy. (I spend the majority of my day with it plugged in)

The performance varies depending on what I am doing. If I do something such as a 3D render its takes twice as long as it would if it was on AC
W520 | 2760QM | 12GB RAM | Quadro 1000M | 500GB 7200RPM HDD | Intel 330 120GB SSD in Ultrabay

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