Using Iray with just the GPU
ChallyII
Posts: 49
I finally bought a new graphics card this week: Having struggled along with an old GTX960, I replaced it with a GTX1660ti. In hindsight, I'd have picked something with more CUDA cores, but it still out-performs my previous one in every way.
Except in rendering that is: It still seems to take me just as long to prduce a finished render. With my 960, I'd find that an indoor scene, relatively well-lit with a single figure, could take over 12 hours before (at 70-80%) it had removed enough of the speckling to be worth calling a halt. As I'm in the middle of a multi-image project, I'd hoped that a new graphics card would speed things along, but after a couple of attempts, I haven't really seen any difference.
Now ordinarily, I render with the CPU and GPU boxes checked, which I've read can slow things down because the system is trying to share the load evenly across card and computer. So I've tried rendering with just the GPU. When I try it, after a moment's thought, the render completes with a blank scene- something I've never seen before. Can anybody suggest what I'm doing wrong?
Edit: I should say that I have researched this issue before posting here, and common responses include: Card not good enough, or not new drivers- neither of which should be an issue in this case.
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Comments
So the problem is that you get a black screen when you use only your GPU?
A 1660Ti is a great card regarding value.
It seems absurd to me that you're taking 12 hours to make a render. I almost never take more than 2 hours, and I have a weaker GPU (1060 3Gb).
So, my guess is that you're using only your CPU! Have you tried with the beta? I know 4.10 didn't support RTX cards, maybe it's the same for new GPUs in general
The scene might be too big for the VRAM of the card. Try rendering a single object and see if that works.
As the previous poster mentioned you do need the 4.11 beta for all Tesla cards, 16xx and 20xx series, as far as I know.
Using the beta seems to have solved it. I tried rendering just a single primitive sphere in 4.10 and couldn't even get that to render with GPU only, but after downloading 4.11, I'm managing to get renders.
Daz should push out some sort of update to 4.10 just to cause a popup to say you need the beta with Tesla GPU's. I've answered this question probably a dozen times in the last 6 months. Which since everyone doesn't come and post on the forum whhen they have a problem that its probably happened dozens if not hundreds of times.
Or it would be nice if there was a sticky thread to cover this stuff. I keep seeing the same questions in the forums over and over, lots of myths and superstitions about Iray settings, and plenty of people asking how to use their AMD card with Iray. I'm not blaming the people asking the questions - there's no shame in asking if you don't know something. It just seems like a lot of these questions could be avoided with a simple sticky thread.
I put this is down to that ridiculous 1660 naming that everybody complained about at the time.
If nVidia had been sensible and called it a GTX 2030 it would have been clear that this was one of the newer GPUs that only work in the Beta.
The problem is that would go against there naming conventions. The 1660 is roughly what a 2050 would be but clearly Nvidia decided that the RTX features on that low a chip weren't worth having.
I found that when I got a blank screen GPU only it meant I needed the latest drivers, that cleared up the problem more than once. It's the gpu not engaging at all, somebody said at the time.