test scene

[vlado]

I meant the nVidia driver version? (Like 266.xx etc)

Best regards,
Vlado

[scottsch]

27 Sec !!!
Distributed rendering with 9 gtx 580 with some on pcie x8.

Pretty amazing hardware steup. At what point (samples or time) is an RT rendering more or less "resolved" to the point where grain is gone and it looks finished? With iray it is approx 2500 samples in 90% of the image (not perfect but pretty close).

[Alan Iglesias]

At what point (samples or time) is an RT rendering more or less "resolved" to the point where grain is gone and it looks finished? With iray it is approx 2500 samples in 90% of the image (not perfect but pretty close).

That seems to really depend on the scene. Texture maps often render quickly with very little noise. Glossy reflections and spec hilights can be noisy and take longer. Flat surfaces with no textures also can be noisy. Also I sometimes like to leave a little noise in my shots...I don't have to add any film grain afterwards!

YMMV...

-Alan

[vlado]

At what point (samples or time) is an RT rendering more or less "resolved" to the point where grain is gone and it looks finished? With iray it is approx 2500 samples in 90% of the image (not perfect but pretty close).

There is no simple rule for that, even for iray. Scenes with difficult lighting situations, lots of light sources and/or GI caustics will usually require more samples. On the other hand, exteriors typically require much less.

Best regards,
Vlado

[saudade]

for external renderings GPU version is fantastic, having a lot of buildings with many glasses is a snap to renderize them.
Unfortunately I have all my scenes with many vray proxies, I can use RT CPU only.

[saudade]

27 Sec !!!
Distributed rendering with 9 gtx 580 with some on pcie x8.

do you have the GTX 3GB?

in proportion how is faster a box with 8 GPU and 8 pc with 1 gpu each one?

[ghiom3d]

I meant the nVidia driver version? (Like 266.xx etc)

Best regards,
Vlado

sorry , this is 266.58 for win7X64

[ghiom3d]

do you have the GTX 3GB?

in proportion how is faster a box with 8 GPU and 8 pc with 1 gpu each one?

no this is not 3GB, but 1.5.
I have my workstation with 1 580 + 2 other in a cubix xpander . it's a 3 GPU computer
I have an other pc with 2 580 GTX, but they are in pciex8 , not at x16.
And i've 4 others pc with one 580 each one.

distributed rendering stay the same think it's was with CPU. The nodes start not at the same time the main workstation, but one by one after some seconds or less, depending your scene and the number of maps.
It's always better to use backburner to render an animation.
But to setup scene and visualising lights, shaders ... DR is very powerfull on GPU !
It's changing my work if some bugs could beeing solved .

[s0real]

anyone tried 267.24 beta drivers yet?

[vlado]

It's changing my work if some bugs could beeing solved .

Can you be a bit more specific - what issues do you have?

Best regards,
Vlado

[sinner]

2x GTX 570 driver 266.58 win7 - 1.34min

[CRD]

Quadro FX1800

42m 42.7s

wow, I didn't realize exactly how pitiful this card is.

[ghiom3d]

32,8s with 6 GTX580 .
1 cubix xpander Desktop2 + 1 cubix xpander Desktop 4
No DR at all, all cards are plugs in my workstation .

[dmeyer]

32,8s with 6 GTX580 .
1 cubix xpander Desktop2 + 1 cubix xpander Desktop 4
No DR at all, all cards are plugs in my workstation .
[ATTACH=CONFIG]6150[/ATTACH]

[ATTACH=CONFIG]6149[/ATTACH]

Nice setup. Which exact 580s are you using? Could you do some tests with some GPUs disabled? Would be interesting to see how it scales with 2,3,4,5 GPU.

[ghiom3d]

4 zotac and 2 pny .No one is overclocked is already really hot and i'm trying to make them cooler .
with only 1 580 someone have say : 2min42s
With 3x 580GTX i have : 1minute
With 6x 580 i have : 32sec
With 9x 580 but some on Pcie8X instead of 16X i have : 27sec. This test isn't very good, i will trying with all cards in 16x later.

It's nearly linear when you see that with 1 card you are near to 3minutes. 3 cards = 1 minutes and 6 card near to 30sec .