Why is the GPU of my nvidia RTX 2070 graphics card hardly used?

art_e0ea62ab6f

Hi,

i bought myself a nvidia RTX 2070 graphics card (CUDA cores 2304, 8GB GDDR 6, memory connection256-bit, clock frequency boost: 1860 MHz, memory clock 14.4 Gbps): Unfortunately Daz seems to hardly use it for rendering. I only selected the graphics card in the render settings, not cpu and graphics card. The image has been rendering for over 9 hours and the GPU usage is 0 to 5%. The image is very high resolution, but would have to render faster if the graphics card was fully used. 

My CPU is a small bottleneck (Intel Core i7 3770K @ 3.50GHz, 32.0GB Dual-Channel DDR3 @ 800MHz), but that alone can't be the problem, because in games the GPU is used to 99% capacity.

Why is the GPU not used to 100%? Is there a guide for optimal settings of a RTX of the graphics card?

 

kenshaw011267

Based on those numbers iRay is using the GPU.

If it had dropped to CPU that would show 100% usage, or nearly so.

Task manage doesn't show CUDA usage by default. Pick one of the graphs for the GPU, click the name and choose CUDA. That should show very heavy use. As to it taking 9 hours to do 2500 iterations? Strand based hair is the most likely culprit, but even then it shouldn't be that bad. You'd need to post all of your render settings to have any chance of figuring out if there's a problem (it could be that it is just that the scene is slow to render for any number of reasons.)

art_e0ea62ab6f

Hi, thank you very much for the quick response.

I have selected "Cuda" in the Task Manager and they are actually permanently used between 95% and 100%. From the dedicated GPU memory also 6.5 of 8 GB. So it is clear that the card is used to its capacity after all.
However, I still don't know why the graphics card doesn't get nearly as hot as in a game.

I render this picture with a preset of "Stonemasons Urban Future 7" and in a very high resolution of 7118x4756 pixels. Now already for 11 hours and 50 minutes with 3175 literations (16% of 100%, no time limit). So it might be that it takes that long because of the quality of the presets. I let it render a bit further and post the exact render settings later.

Otherwise I use the "IDG Easy Iray Studio" with spotlights (scene lighting only) and their render presets for lighting.

But I generally have the feeling that despite the RTX, rendering is often very slow. Maybe there are settings that improve this.

Padone

As for the rendering taking so long to converge, it may be due to dark areas in the scene. You may shoot day for night, or lower the converged ratio and/or rendering quality, depending on your needs. You may also want to try the denoiser though it tends to blur details. For example one possible (extreme) setting is to set quality to 0.1 and activate the denoiser. This basically means the denoiser will try to take care of the bad convergence. You may try it just to see how it works for you.

As for me I don't need fine details in dark areas, so I usually turn off convergence and go with a fixed number of samples depending on the quality I need, typically from 256 to 1024 works fine for me.

kenshaw011267

art_e0ea62ab6f said:

Hi, thank you very much for the quick response.

I have selected "Cuda" in the Task Manager and they are actually permanently used between 95% and 100%. From the dedicated GPU memory also 6.5 of 8 GB. So it is clear that the card is used to its capacity after all.
However, I still don't know why the graphics card doesn't get nearly as hot as in a game.

I render this picture with a preset of "Stonemasons Urban Future 7" and in a very high resolution of 7118x4756 pixels. Now already for 11 hours and 50 minutes with 3175 literations (16% of 100%, no time limit). So it might be that it takes that long because of the quality of the presets. I let it render a bit further and post the exact render settings later.

Otherwise I use the "IDG Easy Iray Studio" with spotlights (scene lighting only) and their render presets for lighting.

But I generally have the feeling that despite the RTX, rendering is often very slow. Maybe there are settings that improve this.

Higher rersolution takes longer.

RTX doesn't help outdoor scenes very much. light rays don't bounce as much so the RTX feature has a lot less to do during a render.

You card doesn't get as hot as when gaming because CUDA, and the RTX cores, are the only parts in heavy use. Games use pretty much the whole GPU, except usually the RTX cores.

I almost never let a render run to full convergence. I use the denoiser and let the render run to 1000 or 1500 iterations which prodcues a scene that is completely acceptable for my uses, making VN's.

golem841

I upgraded from an intel quad core to a 12 cores and from a single 1060 nv card to a dual 2070 gtx. Rendering speed is outstandingly faster, cpu usage is generally 100 percent and cuda use seems to be more sporadic bursts (from windows task manager diplay curves). I tend to render exclusively indoor scenes due to the very limited capacities of daz studio to render plausible organic woodland or grassy pastures) outdoor sceneries, except with hdr files and an abuse of dof. Too bad there's no bridge from studio to eon Vue...

kenshaw011267

golem841 said:

I upgraded from an intel quad core to a 12 cores and from a single 1060 nv card to a dual 2070 gtx. Rendering speed is outstandingly faster, cpu usage is generally 100 percent and cuda use seems to be more sporadic bursts (from windows task manager diplay curves). I tend to render exclusively indoor scenes due to the very limited capacities of daz studio to render plausible organic woodland or grassy pastures) outdoor sceneries, except with hdr files and an abuse of dof. Too bad there's no bridge from studio to eon Vue...

Turn off the CPU in the rendering tab. I've tested with my 1080ti and my 1080ti + R7 2700 and the 1080ti by itself rendered the same scene faster

art_e0ea62ab6f

Hi, I finished rendering after 5000 liters and here are the statistics.

2019-12-30 19:57:21.687 Finished Rendering

2019-12-30 19:57:21.740 Total Rendering Time: 18 hours 39 minutes 45.20 seconds

 

2019-12-30 20:04:10.243 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Device statistics:

2019-12-30 20:04:10.243 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 0 (GeForce RTX 2070): 5000 iterations, 8.466s init, 67132.158s render

I also made screenshots of all render settings. I would be happy if you have some tips for me to improve the settings for the already mentioned resolution.

 

prixat

Are caustics a prominent visual feature of your render? If they won't be missed then switch Caustics off.

Using Caustics can extend render time a lot.