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RTX slower than CUDA with a particular scene
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RTX slower than CUDA with a particular scene
Max 2023.2.2 + Vray 6 Update 2.1 ( 6.20.06 )
AMD Ryzen 7950X 16-core | 64GB DDR5 RAM 6400 Mbps | MSI GeForce RTX 3090 Suprim X 24GB (rendering) | GeForce GTX 1080 Ti FE 11GB (display) | GPU Driver 546.01 | NVMe SSD Samsung 980 Pro 1TB | Win 10 Pro x64 22H2Tags: None
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Well, evidently it does. The question is, is this to be expected with some scenes or is it a bug? I don't remember the official docs and the RTX marketing materials mentioning that it can be slower. In fact, they make it seem that if you have an RTX card, you should always use RTX and that there are no drawbacks performance wise.
Here's another example which is even more extreme. CUDA 30% faster than RTX:
Last edited by Alex_M; 02-07-2021, 06:26 PM.Max 2023.2.2 + Vray 6 Update 2.1 ( 6.20.06 )
AMD Ryzen 7950X 16-core | 64GB DDR5 RAM 6400 Mbps | MSI GeForce RTX 3090 Suprim X 24GB (rendering) | GeForce GTX 1080 Ti FE 11GB (display) | GPU Driver 546.01 | NVMe SSD Samsung 980 Pro 1TB | Win 10 Pro x64 22H2
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it is to be expected. it was discussed somewhere here. there is not a lot of raytracing needed in your scene. hence cuda is faster. more raytracing - rtx, more shading - cuda. one of the real world scenarios is for example a scene containing a lot of foliage with opacity maps.Marcin Piotrowski
youtube
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Hi Alex, as piotrus3333 suggested, in some cases it may be expected. The benefit from RTX will vary depending upon how your scene is constructed and how 'heavy' its shaders are. There might be some CUDA optimizations that are weighing in this scenario, but you can, of course, share the scene so we can test it out further. You can also check the following article (particularly the Mileage varies paragraph) here.Nikoleta Garkova | chaos.com
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Originally posted by nikoleta.garkova View PostHi Alex, as piotrus3333 suggested, in some cases it may be expected. The benefit from RTX will vary depending upon how your scene is constructed and how 'heavy' its shaders are. There might be some CUDA optimizations that are weighing in this scenario, but you can, of course, share the scene so we can test it out further. You can also check the following article (particularly the Mileage varies paragraph) here.Last edited by Alex_M; 05-07-2021, 06:37 AM.Max 2023.2.2 + Vray 6 Update 2.1 ( 6.20.06 )
AMD Ryzen 7950X 16-core | 64GB DDR5 RAM 6400 Mbps | MSI GeForce RTX 3090 Suprim X 24GB (rendering) | GeForce GTX 1080 Ti FE 11GB (display) | GPU Driver 546.01 | NVMe SSD Samsung 980 Pro 1TB | Win 10 Pro x64 22H2
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