I have one system that can use 8 Graphic Cards at once. You can find what kind of system I’m using with attached image file(6GPU_PC.jpg).
Actually I was trying to use 8 GTX 480s with the system.
But the system can not work with 8 GTX 480s. There are some problem with that. So I can just use 6 GTX 480s with the system till now.
And here are the system informations.
OS : Windows 7 Professional K 64 bit(korean)
Ram : 12 GB
CPU : x5570 @ 2.93GHz, 2.93GHz
SW : 3ds Max 2011,
vray_adv_20002_max2011_x64
Driver Version : 266.58_desktop_win7_winvista_64bit_international_whql
I’m trying to test V-Ray 2.0 RT on GPU with the 6 GTX 480s.
But there is one problem with that. There are 6 GTX 480s in the system.
And Windows 7 can find all of them. But V-Ray can just find 2 GTX 480s.
Please attached the other image file to know what happend.
V-Ray 2.0 RT on GPU is working very well just with 2 GTX 480s but I need to use more 4 GTX 480s with V-Ray 2.0 RT on GPU.
Is there any V-Ray option to find all of Graphic Cards in the system?
I think it is automatically done by V-Ray.
If you need futher information to solve this problem please let me know.
I’ll look forward to hearing from you.
Please install the nVidia GPU computing SDK samples (from http://developer.nvidia.com/object/cuda\_3\_2\_downloads.html, download and install the “GPU Computing SDK code samples” package), then run the NVIDIA GPU Computing SDK browser, click on the OpenCL tab, then run the “OpenCL device query” sample - do you see all GPUs there? If you run the CUDA “Device query” sample, do you see all GPUs?
Thank you.
I know it will be one crazy setup with the extreme amount of heat.
I have mentioned that to HW company already but they just prepared 8 GTX 480s. I have a fire extinguisher~
I’ve run the “OpenCL device query” as you told me. It just found two GPUs as V-Ray got it. So I’ve used just 4 GPUs then it was working very well. V-Ray got all of 4 GPUs and it was working great.
It is not V-Ray problem. The problem is from the system. If I use more than 5 GPUs with the system it just recognize 2 GPUs. I need to figure out this. Thank you for all of your support.
Have a great week.
When I used just 4 GPUs it was working great. But from 5 GPUs there is same problem with the system. It recognized just 2 GPUs. So I’m going to add more ram tomorrow.
Hopefully it will work.
I will share the information when I can use all the 8 GPUs.
It depends on the CPU and Graphic Cards for the cost. Hard to tell you now.
Right now we don’t have GTX 580 3GB. But I want to use that one. It is just for testing.
I’ve read that Nvidia don’t support more than 4 gforces per sytem.
If you want more, than you must go with Quadro or Tesla to beeing supported.
I know that sometimes, it’s can work, i’ve read about someone who have 9 gforces in 1 systeme by using Cubix and others systems . I will try later.
But right now, i have 4 Gforces in 1 system, and the other are in my renderfarm nodes.
I just can tell you now it is really nice with 8 Geforce Graphic Cards. And V-Ray RT on GPU is really great RT renderer. I checked with this system. :_)
What mobo is it? 
