Problem with 3DSMAX et CORONA RENDER

[Yoan]

Hello, here are my problems!
I'll start with my problems with 3dsmax, there are a lot of modifications or options (mcloth or other) of 3dsmax that I can't use because either it can take forever or my 3dsmax crashes,
or even just moving a couch (which has several lines/points/polygons) is not fluid (as if I had latency)

Then my Problems with CoronaRender!
It starts when I start working on my image with Materials, it becomes very difficult to work on my materials,
because at a certain point when I do 2D Plan Zoom and run the interactive render (to work in detail on my materials) it can take several minutes just to get an image on the interactive render and even then it never loads very well, it always keeps a certain blur that makes me not see what my materials look like at all.
Then let's say I have finished my materials, I run the interactive render of the whole image one last time before my final render, it is possible that for at least 10 minutes my interactive render will be completely black before loading the image,
Now I make the last settings in Render Setup (image size 3840x****/ Denoising Mode: CoronaHighQuality/ Noise Level Limit 2.0 /...).
I launch my render, again several minutes where the render is black before loading and then the render is EXTREMELY SLOW, it estimates sometimes to 900 hours of render, I have to wait often 2 days to have a drinkable quality.

Very surprising knowing that the components of my PC are the following:
Processor: i9-11900
Graphics Card: Nvidia Geforce RTX 3090
RAM: 64

So I tried Benchmark by Corona to estimate my CPU:
the rendering was done in 2 minutes 25 seconds.
I am 126 of the ranking on 135~ of the Cpu i9-11900 (there are in it the 11900K/11900H/11900F)
and on the general ranking I am 28921.

I have decided to come on this forum, to see if someone had the same problem or if someone has a solution to my problems.

Thank you very much for taking the time to read this long message ahah ;)
Hoping you can help me

[romullus]

Hi,

Since your Corona benchmark result is not very inspiring, first thing i would do is to check temperatures while rendering is going on. Maybe your cooling solution isn't adequate for the job and your CPU is throttling. Also make sure that your system is not running out of RAM, otherwise rendering will become excessively slow. Refer to Corona warning messages and check task manager to asses that. 2 days of rendering single frame is not acceptable at almost all circumstances these days.

[Yoan]

 I'll look at it and I'll make a little update to answer you.

[Yoan]

Here are the temperatures of my CPU

Before rendering:
Core Temperatures 28-29°~
Core Distance 72°~
CPU Package 34°~
Core Max 34°~

During Rendering:
Core Temp. 54°
Core Distance 46°
CPU Package 56°
Core Max 56°

[romullus]

Temperatures are good and how about RAM? Do you get low RAM warning from Corona when rendering? Could you show a screenshot of the task manager memory graph.

[maru]

How many RAM sticks do you have, and what is their frequency? Also, are you sure that they are installed correctly, according to the motherboard manual?

[Yoan]

I have 4 bars of RAM if I am not mistaken in what I see.
I think they are well installed.
Corona does not warn me that the RAM is low.
here are 4 screenshots.

[TomG]

That graph does say you have most likely run out of RAM, which will make rendering go very slowly. Once you get to something like only 10% free, you can run into problems. This wouldn't explain the slow benchmark, though, which is also about twice as slow as it should be.

You'd need to check where those memory sticks are placed, as motherboards usually require certain sticks in certain places, and which slots to use might depend on whether you have 2, 4, 6, etc. sticks installed.

Looking at your benchmark, your CPU only ran at 3.14 GHz (if I am looking at the right one based on your info above of time it took), while those in the top (expected) range there ran at around 5.2GHz, so something is preventing your processor from reaching it's full speed there. Could be RAM configuration, could be overheating so that it stays throttled rather than "turbo'ed", could be something else though.

[Yoan]

First of all thank you for your message TomG.
I went to see if the Ram was well placed on the internet, since I don't know much about it ahah,

my computer is a fully assembled: Asus Pro E500 G600/ i9-11900/
RTX 3090
And my motherboard: W480/SYS and it seems to me having seen graphics on my motherboard, there is no other slot for RAM.

Is it possible that I have to do something from the BIOS to debride my Computer?
And that's where my problems come from?

[TomG]

If you have 4 x 16GB RAM then there is no option other than all 4 slots. If you have 2 X 32GB RAM, then according to page 18 in the manual (https://dlcdnets.asus.com/pub/ASUS/mb/LGA1200/Pro_WS_W480-ACE/E16814_Pro_WS_W480-ACE_UM_V3_WEB.pdf?model=Pro%20WS%20W480-ACE) these should be in the A2 and B2 slots.

You may want to check the BIOS is up to date (the manual will cover updating it). You may also want to check the RAM speed in the BIOS, though I doubt that should create a difference in the boost of the CPU, but still, it is something I've seen machines get wrong if left to pick it for themselves.

Will also want to check what cooler is on your CPU, and compare that to Google searched recommendations for that processor (e.g. https://www.techreviewer.com/best-tech/intel-11900-cpu-cooler/ as the first one I found), to make sure the cooler is sufficient.

[maru]

The task manager is showing 4 out of 4 RAM slots taken, so this is fine.

Please try updating your BIOS and also your chipset driver.

[Yoan]

hello everyone, little update !
After updating the BIOS, the GHz of the processor are exploited much more before it remained at 3ghz, now it is towards the 4.60ghz.
When I use the modify cloth, no more crashes, it still happens to me with floor generator but maybe it's normal when I change the option in question.

I retested the Corona Benchmark rendering, I went from 2min25 to
1min43~
I will test my renders again to see if the speed of the renders has increased a lot,
I tested on one of my big renders and it still takes me: time left 26 hours to reach the noise level limit 2.0.

So maybe I'm misinformed or I'm delusional but I'll ask you the question,
for an average scene with a lot of objects. forest pack for grass and forest, some light.
How much rendering time do you need for a photorealistic image in 4K ?

[romullus]

There's no such thing as average time for specific type of scene. It all depends on how fast are your PC, how big resolution do you need, how complex your scene is and how well it is optimized and so on. Having all that in mind, i think you will agree that your PC is not the fastest in the planet, 4K is quite a lot of pixels and 2% noise threshold demands a lot of calculations to reach, especially in interior scene with potentially complex lighting. We have no idea how well your scene is optimized, but if you'd show VFB performance tab stats during rendering, we may have some clue about that. Also consider to render till higher noise threshold and use more aggressive denoiser settings to clean remaining noise - you can save a lot of time with denoising!

BTW, congrats on solving performance issues with your PC - 1:43 sounds a lot more reasonable time for your CPU.

[TomG]

Sounds like your PC is now performing as expected, nice work! And for the long render time, if it's the scene that showed you reaching 90% memory use, could be a running low on RAM issue - though definitely the issues mentioned above by romullus are worth checking too.

[Yoan]

Thank you very much for your help ;)
and for example I have a scene I took a screenshot of the stats during the beginning of the render, can you estimate the time you would take to get between 3 and 2% of noise level?