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In your DAZ Studio Render settings under Advanced, you will find the area that shows your CPU and graphics cards.

Below the "Photoreal" but above the "Interactive" areas, you will find a box labeled "OptiX Render Acceleration."

In my testing, checking the box to turn this on speeds up my renders, sometimes knocking off a third the render time, sometimes even half!

Others in the benchmark thread on the forum have gotten different results, some saying this even slowed things down.  I'm interested in people's results.
  • Listening to: Redwing blackbird in the creek
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:icondoodlemuffin:
DoodleMuffin Featured By Owner Jun 10, 2018
I have only just found this thread,and right now I could jump through the computer screen,and hug you.Thank you.I set this render up,and it took me 16 minutes to render my figure against just over an hour last night that it took.Wowsers.
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:iconsickleyield:
SickleYield Featured By Owner Jun 10, 2018  Professional Digital Artist
Awesome, I'm glad it helped! :)
Reply
:iconcdjensen94:
cdjensen94 Featured By Owner May 23, 2018  Hobbyist Digital Artist
Oh my gosh, you are a life saver!!! Thank you so much.
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:iconsickleyield:
SickleYield Featured By Owner May 23, 2018  Professional Digital Artist
:)
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:iconheroineadventures:
HeroineAdventures Featured By Owner May 15, 2018  Hobbyist Digital Artist
My god I just found out about this rendering your test scene and was wondering what OptiX is.
It's a night and day diffrence in speed. Thank you so much Adorable Girl Anime Emoji (Kawaii Wink) [V6] 
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:iconsickleyield:
SickleYield Featured By Owner May 15, 2018  Professional Digital Artist
:)
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:iconr2arts:
R2Arts Featured By Owner May 4, 2018  Professional Digital Artist
SECOND UPDATE

Adding a Mesh Light with no photometric light using only the basic default settings, with only the graphics card and no CPU. Did not work. It renders but starts at 3% after like 20 minutes. So it is not efficient.

Rendering using the basic Daz DTHDR-RuinsB-500a.hdr with no lights and selecting no CPU might work for a quick test.
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:iconsickleyield:
SickleYield Featured By Owner May 4, 2018  Professional Digital Artist
Not having any lights work sounds like you might have a graphics card driver issue.
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:iconr2arts:
R2Arts Featured By Owner May 3, 2018  Professional Digital Artist
UPDATE on my previous post.

Added a Distandlight and the results with NO CPU are:

NO RENDER!!!!!!! I am typing this while Daz is going and going and not rendering anything.

That suggests, that using photometric lights involves the use of the CPU for some processing. OR
that the image became larger than the graphics card RAM. Which I doubt on such a simple scene.

I am going to test adding only a mesh light instead of the photometric light.  

 
 


 
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:iconsickleyield:
SickleYield Featured By Owner May 3, 2018  Professional Digital Artist
Well, that's a weird one.  I use photometric spotlights without the CPU on constantly.  Are you sure you added an Iray spotlight and not a 3delight distant light by accident?  I'm sorry if that seems dumb and obvious, but it's an easy mistake to make.
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:iconr2arts:
R2Arts Featured By Owner May 3, 2018  Professional Digital Artist
On an extreme close up of M8s face, I have been testing every possible setting variation using the default values of Daz Iray on a 600X1080 pixel image.

I have not used any fancy settings or other HDR images, just plain Daz defaults.

-------------------------
Graphics card GTX 1080 - 2560 Cuda cores, 8GB Ram, CPU i7 4790k  RAM 32 GB.

------------------------
Render Mode - Photoreal
Progressive Render - Default values
Optimization - Speed
Tone Mapping - Defaults
Environment - Defaults with Dome & Scene and finite sphere. Dome rotation 90.00 because it looked better than default 0

without Optix Prime Acceleration and with CPU - 9 minutes and few seconds
with      
Optix Prime Acceleration and with CPU - 5 minutes and 13 seconds
with      Optix Prime Acceleration and NO CPU   - 4 minutes and 34 seconds

I am surprised to find out that NO CPU goes faster. No CPU allows me to continue to use the computer while rendering.

This results probably depend on the whole image fitting on the GPU ram. 
 
This is the test image

RenderCloseUpM8 02 by R2Arts  
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:iconsickleyield:
SickleYield Featured By Owner May 3, 2018  Professional Digital Artist
That is exactly what it depends on.  When you have a fast graphics card the CPU is actually a bottleneck, and it's better to leave it off (GTX 1080 and GTX 980 over here, second card doesn't make a huge difference but I already had it).
Reply
:icon3doutlaw:
3doutlaw Featured By Owner May 9, 2017
Yep, faster on my machine.  Seems I've been rendering for two years now, slower than I needed to be.  Better late than never!  :)
Reply
:iconblackbeardthemeercat:
blackbeardthemeercat Featured By Owner Edited May 2, 2017  Hobbyist Digital Artist
just tried it, unfortunately when I check my GPU and not CPU renders stop after a few seconds before any image is created, only with CPU checked do I get a render, my GPU is a Nvidia FX 1800M  IN A Dell precision 4500 laptop, checking optix prime doesnt seem to change anything, edit: just read that my GPU isnt capable of Iray rendering , I have been under the illusion that my renders were being done by my GPU for the last 2 years but not so . Doh
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:iconravenheart78:
ravenheart78 Featured By Owner Sep 6, 2016  Hobbyist Digital Artist
do not click both CPU and Graphics card in the advanced menu, if you click graphics card in both the computer is happy, but if you try cpu and graphics card , atleast on my system it slows it down, and slows down computer function if you try to watch videos while waiting for render to complete.
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:iconsickleyield:
SickleYield Featured By Owner Sep 6, 2016  Professional Digital Artist
Videos and rendering both use the dame hardware. You can have faster renders or you can watch videos at the same time, not both.

On my system using all hardware is always fastest.
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:iconratorama:
ratorama Featured By Owner Dec 9, 2016  Professional Digital Artist
At least with CPU unchecked, I can use the internet. ;)
Thanks for the tip!
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:iconconquestus:
Conquestus Featured By Owner Edited Jan 3, 2017  Hobbyist General Artist
If you have a multicore-CPU, you can simply disable one of your cpu cores for DAZStudio to use in the task manager. Most of the time this is enough to still be able to do stuff in the internet, but depends on the cpu tho. So the other Cores can assist the rendering.
Reply
:iconbigzapfer:
BigZapfer Featured By Owner May 22, 2016
Hi Sickly, how do I active this in Daz? I downloaded Optix from the nvidia site and install but no change in Daz :( Thanks in advance for any info you can share
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:iconsickleyield:
SickleYield Featured By Owner May 22, 2016  Professional Digital Artist
Whuh? It's just a check box in the Advanced render settings.
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:iconbigzapfer:
BigZapfer Featured By Owner May 23, 2016
lol oh its on already ;p 

Thanks.
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:iconakizz:
akizz Featured By Owner May 11, 2016
Thank you for this finding! I hope with a latest driver the performance will improve :)
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:iconjstilton:
jstilton Featured By Owner Mar 24, 2016  Hobbyist Digital Artist
so can someone summarize the bottom line? :)
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:iconsickleyield:
SickleYield Featured By Owner Mar 24, 2016  Professional Digital Artist
The blog is four sentences long.  I'm not sure I can condense it more than that?
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:iconjstilton:
jstilton Featured By Owner Mar 26, 2016  Hobbyist Digital Artist
i meant what remains standing after all the comments from people's experiences... :)
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:iconsickleyield:
SickleYield Featured By Owner Mar 26, 2016  Professional Digital Artist
If memory serves the takeaway was that OptiX Acceleration does increase speed if you have recent Nvidia cards, not so much if you're rendering on CPU only or with older cards or AMD cards.  This is reflected by my own experience (two GTX 980's, two GTX 740's).
Reply
:iconjstilton:
jstilton Featured By Owner Mar 27, 2016  Hobbyist Digital Artist
thank you!
i appreciate you helping everyone to find all of this out. it's amazing to me that all this is left to the customers/users and that there is no clearer and more extensive documentation...
Reply
:iconserefina:
Serefina Featured By Owner Feb 10, 2016  Hobbyist Artist
Turning OptiX on crashes out Daz Studio on my machine, guessing it's because of the age of the system - ASRock X58 with i7-950 and a pair of GTX-470-OC gpu's running in SLi.

Having the CPU included in the Iray processors also causes instability, even though it was on and the GPU's off as the install defaults.

Iray performance with the GPU's isn't steallar, but that seems more detrimined by the number of lights then anything else - more lights takes longer.

Same PC runs DaVinci Resolve using the GPU's, but that apps not exactly the best, it'll crash out if vision with different frame rates is selected in the media bin....
Reply
:iconjoltrast:
Joltrast Featured By Owner Jan 26, 2016  Hobbyist Digital Artist
I'm guessing this is only going to make a difference if at least one of your cards is nVidia?
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:iconsickleyield:
SickleYield Featured By Owner Jan 27, 2016  Professional Digital Artist
Yep.
Reply
:iconjaebea:
jaebea Featured By Owner Sep 28, 2015  Hobbyist Filmographer
I just found this thread while researching the Optix.  I know its Sept and this thread was active in March but I am going to throw in my 2 cents on this one.  I have a field scene pretty heavy with plants and flowers, V4, M4 and sun lighting only.  I didn't run a benchmark on CPU alone because I have a GTX970 so I want it to help out the GPU.  GPU alone rendered this scene in 58 minutes.  CPU/GPU in 46 minutes but here is what is interesting.  With Optix, GPU alone and GPU/CPU rendered the same time at 23 minutes.  The fact that it cut my time in half  using the GPU alone was exciting because I can use the computer now while rendering.  When the two were used together, it would top out my CPU (i7 2700, 16g ram).  I am doing the happy dance!!
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:iconsickleyield:
SickleYield Featured By Owner Sep 28, 2015  Professional Digital Artist
Awesome. :)
Reply
:icondamnedcomic:
DamnedComic Featured By Owner Sep 8, 2015
I've been getting inconsistent results, not sure why. But sometimes it makes things faster, and others it doesn't seem to change the speed at all. I'm trying to figure out what the secret is. 
I was playing with ISO settings, so that could be a factor. I had changed my ISO setting from 100 to 50. and I was crushing my blacks .25 
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:icondigitalart-vtg:
DigitalArt-VTG Featured By Owner Sep 5, 2015  Professional Filmographer
This option doesn't matter at this moment. Meanwhile, NVIDIA is working on it's own renderengine and the OptiX has been pluged because of SDK rendering. So, if you are familiar to open source you can download the plugin here--->developer.nvidia.com/gameworks…
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:iconsickleyield:
SickleYield Featured By Owner Sep 6, 2015  Professional Digital Artist
Iray IS Nvidia's own render engine.
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:icondigitalart-vtg:
DigitalArt-VTG Featured By Owner Sep 10, 2015  Professional Filmographer
Yes, we all know that. Maybe I was using the wrong words, what I meant is that Nvidia is still working on some parts for IRay and this option called 'OptiX prime' has not actualled functions yet! I think that this, together with the renderfarms will be part of the next patch.
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:iconsketchingdays:
SketchingDays Featured By Owner Jul 19, 2015   Digital Artist
i7 5930k + GTX 970, shaves off about 25-30% when turned on : D Found the option, randomly googled it and decided to check it out : )
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:iconkitsune102:
kitsune102 Featured By Owner Jul 13, 2015  Hobbyist Digital Artist
I have an  ATI Radeon HD 4200 and i have very slow render times, though i put my pc on sleep while it renders. But it sometimes shows up pixel-ish and i don't know how to find the render settings window/pane/tab with the sample pictures, can you help?frustrated 
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:iconsickleyield:
SickleYield Featured By Owner Jul 14, 2015  Professional Digital Artist
If you don't have a render settings tab on the right side of your screen you may need to add one - right- click by the tabs that are there and choose Tabs - and then click on the Render Settings option.
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:iconkitsune102:
kitsune102 Featured By Owner Jul 18, 2015  Hobbyist Digital Artist
ok thnx :D
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:iconbigmountie1:
bigmountie1 Featured By Owner Jun 26, 2015  Hobbyist Digital Artist
Hi,

I am having painfully slow render times with NVIDIA Iray compared to 3Delight. I'm assuming I'm doing something wrong. My system is a mac mini with a GEForce 9400 graphics card as far as I can make out and yes, I am a newbie when it comes to all this tech stuff. By mini runs 4 gigs of ram and a 2.2 hz processor. I have had only one complete render using Nvidia which was a tiny file and virtually useless. Anything big and it just grinds to a complete halt. Is there any advice I can get that might make things go as fast or faster than 3Delight?
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:iconsickleyield:
SickleYield Featured By Owner Jun 26, 2015  Professional Digital Artist
The 9400 typically has 8 CUDA cores.  The GTX 980 has 2048 CUDA cores.  I use two GTX 980's for my everyday rendering (plus two 740's, but those have too little VRAM to count much).

Iray is demanding of hardware, as all unbiased engines are.  There's not much you can do to make a card that old and with that few cores go faster, I'm afraid.
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:iconmarshian44:
marshian44 Featured By Owner Edited Jun 14, 2015
(MAC) Rendering 91x91 icons- OptiX Prime Acceleration off- 2 min 76 sec. On was 8 min 37 sec. So at this size I can't speak of quality comparison. Under Render Settings/ Advanced/ Hardware/Photoreal (or Interactive) I only have one check box (CPU).

I'm rendering something tricky so it has slowed things down overall from any average content renders. If there is such a thing.

So... UnChecking the OptiX box now.
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:iconvwrangler:
vwrangler Featured By Owner May 26, 2015  Hobbyist Digital Artist
For what it's worth: tried it with a combined GPU/CPU render (the default, and I left it alone because I have so few CUDA cores) using Ronin and lights, with no conversion of anything whatsoever. First render was 12 minutes 32 seconds without OptX; second render was 10 minutes 1 second with OptX.
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:iconsickleyield:
SickleYield Featured By Owner May 27, 2015  Professional Digital Artist
Huh!  That's less of a difference than I usually get.
Reply
:iconvwrangler:
vwrangler Featured By Owner May 27, 2015  Hobbyist Digital Artist
It may be the hybrid render, or maybe it's just that I don't have enough CUDA cores to make a difference. The Nvidia GeForce GTX 745 only has 384 cores, even though it has 4GB video RAM. It's a pure OEM card that only HP and Dell have, and its positioned very strangely in the Nvidia line. Much more RAM than otherwise comparable low-end GTX cards; many fewer cores.
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:iconseumda:
Seumda Featured By Owner Edited May 26, 2015  Hobbyist Digital Artist
Turning on optiX makes my render faster with gpu only. Maybe some ppl got slower render time because using both cpu and gpu render while turning optiX on.
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:icondemontroll:
demontroll Featured By Owner Mar 27, 2015
I did some testing, and The OptiX Acceleration reduced the number of iterations I got for the same scene and the same amount of time.  The OptiX "Acceleration" did allow me to use my web browser faster while I was rendering.  When I use my GPU to render, and I don't have OptiX checked, my web browser is painfully slow (because the render is going faster).

My system: 16 Gb Ram, i7-4790S quad core 3.2 GHz, and Geforce 560 Ti

For a 1200x600 render allowed to run for 5 minutes at the same settings, I got this many iterations (higher is better):

------------------------------ with OptiX -------------- without OptiX (not checked)
CPU Only ---------------------> 88 ----------------------->  86
GPU Only ---------------------> 38 -----------------------> 104
both GPU + CPU ------------> 109 ----------------------> 168

I think OptiX acceleration should have no effect on CPU only renders, as it has something to do with the Nvidia graphics card.
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:iconsickleyield:
SickleYield Featured By Owner Mar 28, 2015  Professional Digital Artist
Is higher better, though?  I think the point of OptiX might be to do the same amount in less iterations.  Are you seeing more fireflies in the OptiX renders?
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:icondemontroll:
demontroll Featured By Owner Mar 28, 2015
Alright, I did a comparison.  I faced the camera directly at a white surface within a complex scene nearby and with complex lighting.  The ideal render will be slightly off white and fairly uniform.  I made two timed renders at 2000x1500 using only GPU acceleration, one with optiX acceleration (red), and one without (blue).  And then I made a reference render where I let it run much longer, so I had an ideal render (green).

Since looking at image quality is subjective, I instead looked at the color distribution between light and dark using GIMP > Colors > Curves (and setting the chart to logarithmic scale).  Then I plotted the three distributions on top of each other.  The best quality has the tightest distribution, where the color is more uniform and consistent.

Click graph for full size:

Testing optiX acceleration by demontroll

So, for my Geforce 560 Ti video card, Iray renders without using optiX acceleration, give both more iterations and a higher image quality, for an equal amount of rendering time.
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