Can not find all of OpenCL devices in the 8 GPU system.

The driver has that problem please dont use the lastest version.

The lastest dirver for geforce has a problem with openCL. Please use low version.

you mean that i need to choose an older Driver ?
wich one ?

That is right. It will be working with version 260.xxx.

thanks you Sersia, i have some animation rendering right now. So i will try later with 260 driver :wink:

It is my pleasure. But I am not sure with GTX 580 but it is working with grx 480 very well. So sorry about that. When you get all GTX 580s with old driver please let me know.

Nvidia Driver 263.09 do the job !!

Thanks you all for your support and you kindness, i have now 6 GTX580 for my workstation and 3 for my renderfarm !!!

What a great news!! Good for you. Have a nice day~ :_)