Hardware & Technical Disable the integrated graphics part of a CPU

[Patrick_68000]

The question is for the technical curiosity

If we disable the integrated graphics part of a CPU (to put an external graphics card of course), the CPU will gain additional power ?

Or the integrated graphics part of the CPU is completely independent and its deactivation does not bring additional power to the CPU ?

For example if the integrated graphics part uses 600Mhz of the total CPU frequency, the deactivation restores these 600Mhz to the CPU or these 600Mhz are independent and thus are not recovered by the CPU ?

 

[Robert Maynard]

My understanding is that the CPU and iGPU cores run at independent frequencies.

 

[Patrick_68000]

My understanding is that the CPU and iGPU cores run at independent frequencies.

So a CPU at 3.5Ghz that uses an IGPU at 600Mhz is in reality a CPU at 2.9Ghz and it never gets the additionnal 600Mhz if the IGPU is disabled ?

 

[Robert Maynard]

So a CPU at 3.5Ghz that uses an IGPU at 600Mhz is in reality a CPU at 2.9Ghz and it never gets the additionnal 600Mhz if the IGPU is disabled ?

Erm, nope.

A CPU at 3.5GHz that has an iGPU at 600MHz remains a 3.5GHz CPU (subject to load based clock changes) while the iGPU clock remains independent of the CPU clock.

 

[Roybe]

Each part is independent....however, the use of computer memory and the subsequent movement/manipulation of that data across that memory to the onboard GPU WILL let the computer run faster, overall.

 

[Robert Maynard]

Each part is independent....however, the use of computer memory and the subsequent movement/manipulation of that data across that memory to the onboard GPU WILL let the computer run faster, overall.

.... now that's a good point.

 

[Patrick_68000]

Erm, nope.

A CPU at 3.5GHz that has an iGPU at 600MHz remains a 3.5GHz CPU (subject to load based clock changes) while the iGPU clock remains independent of the CPU clock.

Interesting !

However it seems to me that I had read that the IGPU uses a part of the CPU frequency

I have to do more research because I have a doubt about it, although I know that you have of the technical skills

 

[Patrick_68000]

Each part is independent....however, the use of computer memory and the subsequent movement/manipulation of that data across that memory to the onboard GPU WILL let the computer run faster, overall.

It seems that Robert is confirmed here