Better CPU performance with Optimus OFF

[mido]

If I plug my laptop to an external screen, optimus disables, thus bypassing the integrated intel hd, and getting better GPU performance.

Thats normal. What I dont get, is that CPU performance also improves.

Cinebench R23 : ~8300

Cinebench R23 (optimus off) : ~8500   (got up to ~8700 with further undervolt, but 8500 score was with the same settings)

 

3dmark Time spy CPU score:  8500

3dmark Time spy CPU score (optimus off): 8700  (CPU test is just 1fps higher)

 

I get 3dmark cpu score might benefit from the optimus off, because it uses the GPU, but why Cinebench score increases too? I tested like 5 times each bench with opitmus on and off.

 

Laptop is a MSI GL65 10750h + 2070 super

[Etern4l]

When active, the iGPU consumes some RAM bandwidth (about 1GBps?). Also remember there tends to be a fair amount of variance in CB23 results.

[Aaron44126]

(Speculation)

If you're hitting power limits, the iGPU would also consume some power, so cutting it off could give a bit more headroom for the CPU to just do "computing".

[Etern4l]

35 minutes ago, Aaron44126 said:

If you're hitting power limits, the iGPU would also consume some power, so cutting it off could give a bit more headroom for the CPU to just do "computing".

 

Interesting. Which specific power limits include power consumed by iGPU?

@Papusan

[Papusan]

12 hours ago, Etern4l said:

 

Interesting. Which specific power limits include power consumed by iGPU?

@Papusan

I mean it should be PL1 

[KING19]

Bypassing optimus improves CPU performance somewhat because with the IGP disabled your CPU works a bit less and nothing is bottlenecking it. Also you should monitor your temps when running benchmarks if your laptop isnt throttling because that can affect your scores too

 

The major improvements in by passing optimus is in gaming mostly E-Sports games like CSGO, Overwatch and etc that are more CPU dependent than GPU dependent.

[Etern4l]

Yes, forgot to mention the obvious that in graphics-intensive applications there is also some additional overhead due to rendered data being also copied to the iGPU frame buffer.

[raptorddd]

am trying to play morrowind fors the first time. i have dell m4600 intel hd3000 and quadro 2000m but i cant get it to use the nvidia GPU. tried nvidia control panel tried right click and pick wich GPU to use. this way i had made it work like 2 times.  when i disable optimus i get double the fps. 

in a laptop with no battery is it ok to run optimus off.? 

[Aaron44126]

13 minutes ago, raptorddd said:

in a laptop with no battery is it ok to run optimus off.? 

 

Yes, Optimus is primarily for power savings.  It is fine to run with it disabled, it generally removes some hassle this way.

 

Inability to get the NVIDIA GPU to engage in Optimus after a GPU upgrade is generally a symptom of the INF mod being done wrong.  I ran into this myself when I did my first GPU upgrade (Quadro M5000M in Precision M6700).  When you do the device ID replacement you have to make sure that you are replacing a configuration that supports Optimus.  These Dell systems actually change the hardware ID depending on if Optimus is enabled or not so you have to pay attention to which hardware ID you are replacing to do the INF mod.

[raptorddd]

3 hours ago, Aaron44126 said:

 

Yes, Optimus is primarily for power savings.  It is fine to run with it disabled, it generally removes some hassle this way.

 

Inability to get the NVIDIA GPU to engage in Optimus after a GPU upgrade is generally a symptom of the INF mod being done wrong.  I ran into this myself when I did my first GPU upgrade (Quadro M5000M in Precision M6700).  When you do the device ID replacement you have to make sure that you are replacing a configuration that supports Optimus.  These Dell systems actually change the hardware ID depending on if Optimus is enabled or not so you have to pay attention to which hardware ID you are replacing to do the INF mod.

thanks for your response.

when you talk about the INF mode you mean the one that you must get your hwid and paste it in to driver.?

becuase i have not touched INF ive never done or use this mod.. am using latest nvidia driver from their website. what i did use was nvclean.

on dell driver optimus is there but on the nvidia theres is no optimus file or folder ive unzipped both drivers long time ago.

[Aaron44126]

15 minutes ago, raptorddd said:

when you talk about the INF mode you mean the one that you must get your hwid and paste it in to driver.?

becuase i have not touched INF ive never done or use this mod.. am using latest nvidia driver from their website.

 

Yes, that's what I'm referring to.  Normally, messing with the INF file is required for "unsupported" GPU upgrades.

 

I'd suggest that NVIDIA didn't actually turn Optimus support on for whatever system this card is being recognized as (since it is not "supposed" to be working) and it would still require an INF mod to "fix" it properly.

 

Probably easiest to just disable Optimus altogether, if you don't actually use the system on battery!

[raptorddd]

3 hours ago, Aaron44126 said:

 

Yes, that's what I'm referring to.  Normally, messing with the INF file is required for "unsupported" GPU upgrades.

 

I'd suggest that NVIDIA didn't actually turn Optimus support on for whatever system this card is being recognized as (since it is not "supposed" to be working) and it would still require an INF mod to "fix" it properly.

 

Probably easiest to just disable Optimus altogether, if you don't actually use the system on battery!

thanks now that you brought that up... what is the purpose of modifying the INF to a newer driver if your card isnt supported anymore. what do you gain out of it.???

 

any tutorial to do this and add optimus. ?