Power usage iGPU AMD7800x3D

[JackOO7]

Hi,

For my setup see my system specs.

As you can see the PSU of my system is an Asus Thor II. This PSU has a screen which shows the current powerdraw of the system.
My system also has 2 GPU's, a 4090FE and the internal GPU of the 7800X3D. The (single) monitor is connected to the 4090.
When both are "active" (iGPU not disabled in bios) the power draw of the system is about 110-115 W in idle.
GPU-Z shows that the AMD iGPU draws about 37 W. This seems high for a GPU that does nothing and is a significant portion of the 110-115 W.

I would expect that when the iGPU is disabled in bios the total power draw of the system would decrease. Maybe not the full 37 W or so but still a good portion of that.
Unfortunately it doesn't. After disabling the iGPU in bios the total power draw stays the same at about 110-115 W.
Can anybody explain this? Is GPU-Z wrong or is something else going on.

 

[Vayra86]

It is lying to you. There is just 37W going through the CPU. The load is 0%. After all, the GPU IS the CPU.

 

[londiste]

GPU-Z is showing the CPU Package Power there.

 

[Lew Zealand]

100% on both previous responses. I use an AMD MiniPC and total CPU+iGPU power is listed in the GPU Power Draw section in GPU-Z. The CPU and iGPU power metrics are not separable.

 

[JackOO7]

If GPU power draw is not what is shown maybe it should be labeled different to clarify.
Like CPU+GPU power draw or Package power draw.

 

[Toothless]

Look at Adrenaline for power usage for the iGPU.

 

[Lew Zealand]

Look at Adrenaline for power usage for the iGPU.

Adrenalin's Performance tab Metrics gives the same power value in Zen 4 APUs (R7 7840HX) as GPU-Z, it sums the power of the entire thing. Looks like desktop iGPUs aren't treated any differently?

 

[Toothless]

Adrenalin's Performance tab Metrics gives the same power value in Zen 4 APUs (R7 7840HX) as GPU-Z, it sums the power of the entire thing. Looks like desktop iGPUs aren't treated any differently?

Now you're making me question my sanity because I could've sworn those metrics showed exclusive iGPU power.

 

[Athlonite]

Erm have you ever thought to just turn it off if you're that worried about the power draw, if you're not using it for anything go into your BIOS and just turn it off

 

[londiste]

Erm have you ever thought to just turn it off if you're that worried about the power draw, if you're not using it for anything go into your BIOS and just turn it off

It is one of those things where you need to go into the AMD CBS menu and the option is either not clearly labeled and/or does not work?
I have not tried with the recent BIOSes but at least earlier on that was the case for me.

 

[eidairaman1]

Erm have you ever thought to just turn it off if you're that worried about the power draw, if you're not using it for anything go into your BIOS and just turn it off

What is nonsense is user has a 4090FE and is complaining about power draw, how about op just unplugs the computer.

 

[Vayra86]

Is it complaining or just optimizing his rig?

 

[londiste]

What is nonsense is user has a 4090FE and is complaining about power draw, how about op just unplugs the computer.

The question was about idle. When that 4090 ends up consuming less than iGPU (or the whole CPU) package I would call this a pretty justified complaint

 

[JackOO7]

@eidairaman1
1. As @londiste stated (on a side note; I barely use the 4090. It was more an esthetic choice)
2. It made no difference to the power draw if the iGPU was enabled or disabled in bios which would be an issue if the 37 W power draw iGPU was correct.

 

[Panther_Seraphin]

The question was about idle. When that 4090 ends up consuming less than iGPU (or the whole CPU) package I would call this a pretty justified complaint

Its the unfortuante side effect of AMDs chiplet design where the CPU cores seem to power down to higher S states with no issues, but the I/O die seems to run at 100% all the time ¬_¬ and I am not aware of a way beyond underclocking the IF and lowering the IO Die voltage to lower that power draw.

I mean the iGPU on these parts are only two CUs so they use so little power its probably around 8 watts under 100% load anyway going on a 6th of the power draw of a RX6400 with similar boost figures and a 6th of the CUs

 

[AusWolf]

Must be a reading error. There's no way the iGPU eats that much even during full load, not to mention at idle. Disabling it won't help much.