itou31 wrote:Hi,
just finish my 7 GPUs build and check for performance scale.
I noticed that it didn't scale well as I can see on my 4 GPU rig (with titan and 780ti ==> bench of 4 ~ sum of each individual bench)
...
nominally, it should be about 1140, if it scales well (220+220+160+160+160+110+110).
So what do you think, the PMC perhaps, and memory ?
I have an xeon e5-2696V3, I think enough for that. I will check with a real scene.
here is my take on that, but I might be wrong..
You CPU seems to be not the fastest one & since it has a lot to do with 7X GPU what You end up is those cards waiting for information without being able to render. Again amount of cores doesn't matter so much here as Octane could not take advantage of more than 4cores unless smth has been changed lately.
In order to see what's exactly happening & where performance is lost it would be cool to have a printscreen of OctaneBench in action with some CPU monitoring app that would should load of CPU + Frequency it is running + like 7 instances of GPUZ with sensor tab opened for different cards or MSI afterburner with custom layout & graphs.
Seems that in V3 we start seeing more of these situation where scaling is no longer linear..however to find exact reason might take some time. Let us know if You would have more information to look at =)