2 GPUs Slower than 1

[Drevangough]

Hey Guys,

I'm using octane with C4D.
Running into an issue where 1 GPU renders a frame in the same time it takes two to render.

I have a 780 6gb and a 780ti 3gb.
Priorities have been set to high.

I was hoping than when I set both to render I could at least shave off maybe half the time but nothing improves.

I know the system will use the lowest common denominator when it comes to vram.
Is there anything else I need to know about?

Thanks for any advice/help.

[bepeg4d]

Hi Drevangough,
maybe overheating?
Can you share more info about the specs of the machine?
Like:
A. Operating System, including version (i.e. Win 7, OSX 10.11.2, Ubuntu 14.04, etc.)
B. Graphics Card(s) model (i.e. GTX 980 - 4GB, TITAN, etc.)
RAM Capacity (i.e. 6 GB), CPU (i.e. i7 5930k), Motherboard (i.e. ASUS Z99-WS)
D. Nvidia driver version (i.e. 7.50, 7.5.22)
E. OctaneRender Standalone version, if installed (i.e. 3.03.2, 3.04.3, etc.)
F. OctaneRender plugin version (i.e. v3.03.1-R1 - 3.04.3)
G. Host application version, including build number if available (i.e. 3ds Max 2016 Build 18.0)

In particular, what is the exact model of the GPUs?
ciao beppe

[glimpse]

Strange, could You please run OctaneBench & fire up two instances of GPUZ (free program You can get from internet)? simply open sensor tab of GPUZ for both GPUs (choose in the bottom) - we'll take a look what happens on a hardware level while Your cards are under load.