GPU render failure strangeness

[stemfour]

Apologies if this is already covered - I did search thoroughly and couldnt find this specific issue.

I had Octane VR working in C4d fine, with my single 780ti.

I then introduced a gtx 660 in to the setup, to run my monitors from, and thus use my 780ti purely for rendering. However, since introducing this card to my setup, Octane constantly loads the live viewer with "Render Failure!!! Check console.." etc

Console log shows the following:

OctaneVR 3.06.2 (3060200)

CUDA driver version is too low - can't use CUDA
----------------------------------------------------------------------------------------
<<< Render failure detected!!! >>>
Please check render statistics to solve the problem.
MB:0/0 ST/MOV:0/0 Nodes:0 Tris:0 DispTris:0 Hairs:0 Meshes:0
VRAM used/free/max:0Kb/0Kb/0Kb
Free VRAM is too low!
Try to decrease polygon counts and use out-of-core for textures.
Use 'render instances' when it's possible.'
Scene created in plugin version -1

So, out came the 660 gpu, and back to the original setup ( after trying to update/roll back drivers etc, checked for power issues... )

However, with the original setup, just the single 780ti, Im still getting the same error as above. It seems like introducing the 660 did something strange to the CUDA driver installation. I have reinstalled the Nvidia driver, and the same issue remains.

Please help! THanks

[stemfour]

Ok - solved it by rolling back to a previous Nvidia driver, then reinstalling the latest one over the top, clean install.

Will leave this here in case it helps anyone else.