Does enabling the iGPU affect CPU perf?

[Simple_imbecile2]

With DX12 coming in short order, and supposedly enabling dissimilar graphics cards to work in tandem, and my budget being thin, I want to (if the rumors are true) turn the integrated graphics and pair it with my 780ti, but I don't know if enabling the integrated graphics on my cpu will lower the overall performance of the system? I've got it cooled by a corsair h100 while I'm waiting on a new res for my water loop, so heat isn't too much of an issue. Also, when enabling the iGPU on my CPU, does it use my DRAM like my GPU would use VRAM? Is there an option I can set to change the allotment of RAM it uses? Thanks in advance for the help folks, I appreciate it! I've googled my fingers raw with almost no results on any of my questions.

 

[IntelTurtleFan]

I would not have it enabled unless your are using it (that your are not). It does effect wattage.

 

[Simple_imbecile2]

I would not have it enabled unless your are using it (that your are not). It does effect wattage.

I don't have it enabled, however, in my hypothetical case, being that dx12 allows dissimilar GPUs to operate in tandem, it would be silly to not have a "spare core" working with my GPU to make my games of solitaire that much more flashy (Kidding, I play a lot of FPS) and operate at a usable framerate with more stability
edit: as far as I understand the iGPU on my 4770k is it's own "core", if that's wrong, pardon my mistake

 

[IntelTurtleFan]

It will make no difference in whole. Except use more power. CPU's like Xeon 1231 v3 do not have iGpu and perform better in games than the i5. The only real difference between the i7 47xx and a 1231 v3 is the Xeon does not allow for overclocking and it does not have an igpu. And the Xeon has a 70 dollar cheaper difference in price. You are right to say it is separate but it does use more power.

 

[Simple_imbecile2]

Awesome! Thank you kind sir, your badges are well earned! [strike]Do you happen to know about the memory of the iGPU? I don't know if it's from the DRAM or if it's just limited to whatever it's built with.[/strike] nevermind! I did just find an article, BIOS controlled. You're a champ nonetheless!

 

[IntelTurtleFan]

Your welcome

 

[de5_Roy]

With DX12 coming in short order, and supposedly enabling dissimilar graphics cards to work in tandem, and my budget being thin, I want to (if the rumors are true) turn the integrated graphics and pair it with my 780ti, but I don't know if enabling the integrated graphics on my cpu will lower the overall performance of the system?

i assume you're talking about unlinked explicit multiadapter:
BUILD 2015: The Final DirectX 12 Reveal
http://www.pcper.com/reviews/Graphics-Cards/BUILD-2015-Final-DirectX-12-Reveal
the catch with that one is that it's left out to developers. if they don't use it, you won't be able to use it.

I've got it cooled by a corsair h100 while I'm waiting on a new res for my water loop, so heat isn't too much of an issue.

cooling won't be an issue to the igpu, unless you have the cpu cores overclocked to limit. unlinked multi adapter (lazily referred to as uma from here onwards) will cause igpu utilization to increase from almost none to near max. in ideal situations. the igpu is also part of the host proseccor silicon, it'll share total power budget of the whole processor.

Also, when enabling the iGPU on my CPU, does it use my DRAM like my GPU would use VRAM?

yes, it will use system memory as frame buffer. iirc default the max limit is 1.7 GB, dynamically allocated.

Is there an option I can set to change the allotment of RAM it uses? Thanks in advance for the help folks, I appreciate it! I've googled my fingers raw with almost no results on any of my questions.

yes, from the bios. however, intel dynamically allocates video memory (dvmt).

 

[Simple_imbecile2]

With DX12 coming in short order, and supposedly enabling dissimilar graphics cards to work in tandem, and my budget being thin, I want to (if the rumors are true) turn the integrated graphics and pair it with my 780ti, but I don't know if enabling the integrated graphics on my cpu will lower the overall performance of the system?

i assume you're talking about unlinked explicit multiadapter:
BUILD 2015: The Final DirectX 12 Reveal
http://www.pcper.com/reviews/Graphics-Cards/BUILD-2015-Final-DirectX-12-Reveal
the catch with that one is that it's left out to developers. if they don't use it, you won't be able to use it.

Here's hoping that they utilize dx12 to the max!

(quotes broke, cbf to remember bbcodes)
I've got it cooled by a corsair h100 while I'm waiting on a new res for my water loop, so heat isn't too much of an issue. [/quotemsg]
cooling won't be an issue to the igpu, unless you have the cpu cores overclocked to limit. unlinked multi adapter (lazily referred to as uma from here onwards) will cause igpu utilization to increase from almost none to near max. in ideal situations. the igpu is also part of the host proseccor silicon, it'll share total power budget of the whole processor.


It's as overclocked as I can get it, I'm sure with a bit more technical knowledge someone could squeeze more out of it! I was moreso questioning that (physically) the intel iGPU was it's own core, do you perchance know if the new AMD APU iGPU is a separate core from the CPU core?

 

[de5_Roy]

It's as overclocked as I can get it, I'm sure with a bit more technical knowledge someone could squeeze more out of it! I was moreso questioning that (physically) the intel iGPU was it's own core, do you perchance know if the new AMD APU iGPU is a separate core from the CPU core?

could you clarify the "core" bit? afaik, the cpu and the igpu have their own clock and voltage domains and the latest ones can independently clock up and down to save power. you can also seperately overclock each part. but neither are safe from the limits of physics. if you want to o.c. both up to limit, you might have to trade off o.c.ing one for another. YMMV.

 

[Simple_imbecile2]

It's as overclocked as I can get it, I'm sure with a bit more technical knowledge someone could squeeze more out of it! I was moreso questioning that (physically) the intel iGPU was it's own core, do you perchance know if the new AMD APU iGPU is a separate core from the CPU core?

could you clarify the "core" bit? afaik, the cpu and the igpu have their own clock and voltage domains and the latest ones can independently clock up and down to save power. you can also seperately overclock each part. but neither are safe from the limits of physics. if you want to o.c. both up to limit, you might have to trade off o.c.ing one for another. YMMV.

this is the 4770k the graphics core has it's own physical area