Not an answer, but my little knowledge on GPU processing:

AFAIK, CUDA or OpenCL uses idle resources of the GPU, so I guess that you are safe even if you don't know (or have ways of) forcing one of them to X11.

Good luck and happy new year
Francisco

On Mon, Jan 2, 2012 at 8:12 AM, <meino.cramer@gmx.de> wrote:
Hi,

Happy new year! :)

...before I make my GENTOO box unaccessible to me ... ;)

For rendering with blenders new Cycles GPU based renderer
I want to setup my box as follows:

Rendering should be done with the GTX 560 Ti nvidia card and
the "normal" desktop (aka X11) should be handled via the
GT 430 nvidia card.

Both cards are already inserted into the box and seem to be
recognized since lspci reports:

   02:00.0 VGA compatible controller: nVidia Corporation GF108 [GeForce GT 430] (rev a1)
   09:00.0 VGA compatible controller: nVidia Corporation GF110 [GeForce GTX 560 Ti] (rev a1)

Nvidia-setting also reports both cards the 560 Ti one is recognized as
GPU0 the other one as GPU1.

Currently X11 uses the GTX560Ti and the GT430 is "idle" (has neither
a "display-" nor "rendering-job").


How can I move the "display-job" to the GT430 ? How can I urge X11 to
exclusively use the GT430 for its purposes?

Thank you very much in advance for any help!

Best regards,
mcc









--
"If you have an apple and I have an apple and we exchange apples then you and I will still each have one apple. But if you have an idea and I have one idea and we exchange these ideas, then each of us will have two ideas." - George Bernard Shaw