Issue 9. Windows and the Nvidia driver see all available GPUs, but OctaneRender® does not

There are occasions when using more than two video cards that Windows and the Nvidia driver properly register all cards, but OctaneRender does not see them. This can be addressed by updating the registry. This involves adjusting critical OS files, it is not supported by the OctaneRender team.

  1. Start the registry editor (press the Start button, then type "regedit" to launch it.)
  2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E968-E325-11CE-BFC1-08002BE10318}
  3. You will see keys for each video card starting with "0000" and then "0001", etc..
  4. Under each of the keys identified in 3 for each video card, add two dword values: DisplayLessPolicy and LimitVideoPresentSources and set each value to 1.
  5. Once these have been added to each of the video cards, shut down Regedit, and then reboot.

OctaneRender should now see all video cards.