Does adding a Dedicated GPU lower CPU Usage??

Pramit Kumar Biswas · Nov 26, 2015

I am currently using a brand new i5 4440. My friend is using i5 4460. Now while playing GTA V with Intel HD Graphics his CPU usage was around 80%. He bought a new GTX 750ti and his CPU usage is now 50% with same settings. He gets now even more FPS.

DonkeyOatie · Nov 26, 2015

Yes. Without a dedicated GPU, the CPU has to do everything on it's iGPU, with a dedicated GPU, some of the load is shifted off.

Crixilian · Nov 26, 2015

sorry for my bad
integrated GPU has integrated GPU core itseft and CPU core has CPU core itseft
GPU core and CPU core is seperated

technically disable integrated GPU wont faster CPU, but it will make CPU run cooler and run faster
because integrated GPU core is at CPU

that your friend get more FPS is because of his GPU. GTX has faster graphic performance

RobCrezz · Nov 26, 2015

Er I was just viewing the thread, didnt mean to downvote, sorry..

DonkeyOatie · Nov 26, 2015

RobCrezz :

It's good. I know you. I can take it. Or just balance by upvoting this one.

DonkeyOatie · Nov 26, 2015

Crixilian :

But the question was not FASTER, but USE.

RobCrezz · Nov 26, 2015

DonkeyOatie :

Yeah annoyingly you cant upvote after downvoteing by accident. :pt1cable:

Crixilian · Nov 26, 2015

DonkeyOatie :

yep, that is what I explained by GPU core and CPU core are seperated

Pramit Kumar Biswas · Nov 26, 2015

So is his Nvidia GPU taking the load off ??? If not how is the load of CPU decreasing ???

DonkeyOatie · Nov 26, 2015

The cores are separated, but the iGPU uses system memory and the shared resources of the CPU.

Pramit Kumar Biswas · Nov 26, 2015

DonkeyOatie :

Thank U very much guys...that means if I am buying a new GPU , I am going to get a little less cpu usage.

Crixilian · Nov 26, 2015

Pramit Kumar Biswas :

ohh i see, thx

DonkeyOatie · Nov 26, 2015

Pramit Kumar Biswas :

Yes. If you increase the settings from 720p to 1080p and from low to ultra effects, the CPU load often drops as the GPU take even more load, although FPS may fall too.

Pramit Kumar Biswas · Nov 26, 2015

Crixilian :

bystander · Nov 26, 2015

Assuming we are talking about gaming here. Your CPU usage is tied to your FPS. If you increase your FPS by using a faster D-GPU, your CPU usage will go up.

But, as has been mentioned, the iGPU on the chip will no longer be used. Technically that is not the CPU, but it does steal RAM and draws more heat.

Pramit Kumar Biswas · Nov 26, 2015

bystander :

But I have decreased the fps only to see the CPU usage but nothing changed. The usage remains same at 20fps and 100 fps.

bystander · Nov 27, 2015

Pramit Kumar Biswas :

There is usually 1 dedicated thread that's sole job is to feed the GPU instructions on how to render a frame. This is the thread/core that is hammered hard, and it will go up or down depending on how fast your GPU is generating FPS.

If all you did was look at the total usage, you may have not noticed a major change, as there are other threads on other cores which might not change a lot. So you see 22% at 100 FPS, and 19% at 20 FPS, but if you look at the cores, there is a core whose usage that will drop as your FPS drop.

DonkeyOatie · Nov 27, 2015

CPU usage is the average of cores. Hypothetically, a CPU like an i5 can be limited at 25% usage. One core is limited at 100% and the other three cores are doing nothing. Even one core averaging 75%, wit peaks of 100% and troughs of 50% could still cause performance issues.

Does adding a Dedicated GPU lower CPU Usage??

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