Daz suddenly not recognizing cpu

[Kolossum3D]

So I was going to make some renders today for my vn and iray just won't work at all with my gpu outta nowhere? I changed no settings since yesterday. I have the cpu options unticked on the hardware settings for Iray, I updated drivers to check if it worked but still the same issue, I DDU'd and reinstalled drivers and it still doesn't work. I don't understand why it's not working suddenly because I'm rendering on the same scene I was rendering yesterday. Whenever I try to render something it just gives me a black render after a few seconds but if I let it use the cpu it actually renders the scene. My gpu is a NVIDIA GeForce RTX 4070 laptop gpu. I've been trying to fix it for a couple hours and looked it up so many times online but nothing works.

 

[anne O'nymous]

[...] Whenever I try to render something it just gives me a black render after a few seconds [...]

What is puzzling, because it's the symptoms of a too old driver, while you insisted on the fact that you ensured to have up to date drivers.
It's also strange that it happened suddenly, without actual software changes, and with a scene that was rendering fine before. Without the last point I would possibly consider the sub division as being a possible cause, but there's no reason for it to be good one day, then suddenly too demanding the day after.

You should probably ask on Daz forum instead of here, there's more chance that someone can solve this mystery.
Just please, if the answer can be summarized, try to remember to give it in this thread too, or at least add a link to it. It would be frustrating for someone who one day face the same problem to end in your thread and be leaved without answer.

 

[Kolossum3D]

What is puzzling, because it's the symptoms of a too old driver, while you insisted on the fact that you ensured to have up to date drivers.
It's also strange that it happened suddenly, without actual software changes, and with a scene that was rendering fine before. Without the last point I would possibly consider the sub division as being a possible cause, but there's no reason for it to be good one day, then suddenly too demanding the day after.

You should probably ask on Daz forum instead of here, there's more chance that someone can solve this mystery.
Just please, if the answer can be summarized, try to remember to give it in this thread too, or at least add a link to it. It would be frustrating for someone who one day face the same problem to end in your thread and be leaved without answer.

Even weirder is that it's working again outta nowhere. I won't complain but lmao. It's just annoying that I don't really know exactly what the cause is.

I asked it somewhere else and they said that it could be because of vram, but if it was so I think it wouldn't start working again and render the same scene with even more models on it.

 

[anne O'nymous]

I asked it somewhere else and they said that it could be because of vram, but if it was so I think it wouldn't start working again and render the same scene with even more models on it.

Well, it depend. Not because the VRAM would have one or more damaged bank(s), since it will not magically repair, but thinking about the hardware, "damaged something" isn't the only possible factor.

I don't say that it's the case for you, but heat is also an important factor. Some cards with NVidia GPU have sensor for the RAM temperature, in top of the one for the GPU temperature. So technically speaking it can be the VRAM without being a question of damaged banks. NVidia GPUs and their drivers also have two "slowdown mode", one purely based on software, and one hardware based, triggered automatically to protect the GPU.
I never experienced the slowdown modes or a too heavy temperature, but I guess that it would have the same effect than an out of date driver; Daz Studio starts to render on GPU, since it found one, but end with a black render since the GPU answer something like "I'm Sorry Daz, I'm afraid I can't do that".
But, while it's a possible cause, I doubt that it's what you experienced, reason why I don't talked about it at first. As you describe the issue, there were a full night between the "it render" and the "it don't render" situation. So, for the heat or slowdown mode to be the cause, it would have needed that you had an intensive use of the GPU, then decide to start rendering right after this. And when I say "right after", I mean something like few seconds, since in generic condition a full minute is already good enough for the heat to lower and/or the cause of the slowdown mode to disappear.
Or... (sorry, I think while I write), the cause was electric... Some irregularities or peaks for the power unit. I guess that it could trigger the slowdown modes.