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RTX 4090 Won't Undervolt via Power Limit Slider??

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I have a Gigabyte Gaming OC 4090. I've always used MSI Afterburner for my previous GPUs for years, and that software always worked fine with them.

I have MSI Afterburner 4.6.5 installed. In options, for "Update Checking Properties" I have the beta box checked, and MSI Afterburner says I have the latest version.
I have Windows 10 and NVIDIA driver 555.99 installed. Windows 10 is up to date.
I also installed Gigabyte's GCC software (updated to latest), and have my GPU updated to the latest firmware and BIOS version via GCC.

GCC and MSI Afterburner both have a power limit % and temperature limit option. I've tried combinations of linking and unlinking these. Also combinations having only one or the other programming running, or both together.

Nothing makes a difference. I tried 90% the power limit and 80% the power limit. My GPU benchmark scores (Heaven and Shadow of the Tomb Raider) are the same. I also have a Kill-A-Watt meter, which the PC is connected to the AC outlet. I watch it as the benchmarks occur, and the PC's power draw is the same as with 100% power limit.

I don't know what I'm missing here?? What else should I check?
 
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Try reducing it further. 100% is 450W iirc which you're unlikely to reach when gaming.
TPU's review of this card showed it using ~350W in games so you'll likely see it drop @ 75% or lower.
 

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GCC and MSI Afterburner both have a power limit % and temperature limit option. I've tried combinations of linking and unlinking these. Also combinations having only one or the other programming running, or both together.

Try uninstalling all of them - MSI ab, GCC and Nvidia driver.

Then install the driver and just MSI afterburner and see if that works, otherwise go into MSI ab and see if there is something you're missing from a checklist in the options that is not enabling you to use the PL.
 
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Should look like this. If doesnt work maybe wait for new update.
this.PNG
 
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Working as expected for me.

What I run mine at.
Screenshot (4).png

Stock
Screenshot (5).png
 
Last edited:

..0

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in some ways power limit wont ever undervolt as a curve edit will, but curve are not as good as it was for the older generations.
what i did was keep lowering the power limit, at one point something will happen, mine is at 50%.
there seem to be some break points, so it does not scale linearly.
then try to overclock, i have mine at +150mhz.
that seem to get me a good mix between low power and noise with performance.
my temp limit is at 80c if that makes a difference.
 
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So I decided to just try the VF curve to see if that works. It's the undervolting method I've used on my other cards. Surprisingly, the curve DOES work. But the clocks don't work correctly. I can put 2700+ MHz clock at 0.9v and it will pass the 3DMark stability tests. It will also just be 1% faster than running 2520 MHz at 0.9v. I remember Optimum Tech doing a video on this over a year ago, and at the time I didn't have a 4090. Basically using the curve is wonky with the 40 series. I'll eventually uninstall and reinstall these programs which will hopefully fix the power limit issue I'm having.

On an awesome side note ... Running the same SOTTR benchmarks stock vs 0.875v at 2520 MHz, the peak and average PC power used from the AC Outlet (per actively watching the Kill-A-Watt) has dropped anywhere from 80 watts to 130 watts. The 3 benchmark runs (did 3 for each test) only dropped from mid 160s FPS to low - mid 150s FPS.
 
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So I decided to just try the VF curve to see if that works. It's the undervolting method I've used on my other cards. Surprisingly, the curve DOES work. But the clocks don't work correctly. I can put 2700+ MHz clock at 0.9v and it will pass the 3DMark stability tests. It will also just be 1% faster than running 2520 MHz at 0.9v. I remember Optimum Tech doing a video on this over a year ago, and at the time I didn't have a 4090. Basically using the curve is wonky with the 40 series. I'll eventually uninstall and reinstall these programs which will hopefully fix the power limit issue I'm having.

On an awesome side note ... Running the same SOTTR benchmarks stock vs 0.875v at 2520 MHz, the peak and average PC power used from the AC Outlet (per actively watching the Kill-A-Watt) has dropped anywhere from 80 watts to 130 watts. The 3 benchmark runs (did 3 for each test) only dropped from mid 160s FPS to low - mid 150s FPS.
I assume when you are changing the power limits you also press the apply button, right?
 
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