GPU power draw and fan getting crazy

[FranklinTre]

Hello there !

I'm experiencing two issues and I can't find any answers on them.
I'm using the last Vray release with RTX 3090; custom frequencies and monitored by Msi Afterburner. Nvidia Driver Studio : 528.49

First one : I can see the Power Draw is starting at 100% for 30 sec (ish) at 320W and drop down to 250W in any scene, buckets or progressive mode. The anoying thing is, is that the clock of the GPU is starting as it maximum of 2050 mhz and drops down to stabilize at 1750 mhz. Its quite a big loss of power and speed ! Is it normal ? It's quite cool to have a low power draw, but not if it's meaning the lost of 15% power.

Second one : In progressive mode that I use all the time, I see that this power draw as bumps to 100%, regularly, every 30 to 60 sec ; causing the fans of the RTX3090 going absolutely crazy to their maximum speed for a few seconds each time. Its a very very anoying thing. The fans are calibrated by afterbruner along a curve to diminuished the sound usage. This curved is perfectly followed in any software, or in vray bucket mode ; but it's getting crazy in progressive mode because of the power draw bumps.
Is it a normal behavior ?

Thanks for the ansers you could get me!

[FranklinTre]

UPDATE
Further investigations later I understood the problem. My card just reached high temperature core and the voltage (and power) lowered automaticaly to protect the core. That's is why the fans were going crazy from time to time. Lowering power makes the clock running higher and cooler...

Which brings us back to the first problem : why on earth the progressive rendering mode (brute force or light cache) is not running at a steady voltage, it's bumping all the time causing big problems of stability of the heat, power draw, and core clock. It's not happening in bucket mode, and worse than that, I noticed that my card is running much faster (and cooler !!) in IPR mode wich is also a progressive mode! In that ultimate case, the voltage is steady, core clock is at the roof and somehow the heat is contained ; it's way more stable.

Why the progressive mode as a bumping voltage and power draw, causing a loss of power, heat bumps, and instability? Is it a know issue?

[Vizioen]

Might want to post this in the Vray GPU forum might have more luck there: https://forums.chaos.com/forum/v-ray...ay-rt-problems

[^Lele^]

It looks like the GPU is denoising the image from time to time, which can happen only while progressive mode is being used.

[Ihno]

The thermal throttling is a hardware problem.
A card should run at 100% with stock clock for month with no problem. You might have a problem in your PC case is there enough space underneath the card for it to get air? Do you have case fans?

I had a 2080TI from MSI That was also overheating and thermal throttling. Turned out somebody in the factory did a bad job in applining thermal paste. I took it apart, cleaned it and reapplied thermal paste and it runs pretty quiet and cool now even if i have it rendering for hours.
My warranty was gone already. If you still have warranty, better return it and get another one because it'll be gone as soon as you take it apart.