Multi-GPU anomalies

from AshesoftheSingularity Forums

with the latest beta 2 patch, I am seeing strange behavior. I am currently running 3 watercooled 290x cards on a 3960x in a Intel DX79SR motherboard.  I am aware the current version will only utilize two GPUs atm.  What I am observing is, low average CPU framerate on all benches. in fact the framerate matches the actual frame rate which is different behavior I have observed previously.   

My understanding is CPU framerate is the framerate of the CPU total system as if it had an infinitely powered GPU. it used to be in the 150 FPS range prior to beta 2 now its seems to be always just under the actual GPU framerate which doesn't make sense. I am also not seeing any significant FPS gains from 1 GPU to 2 GPUs even though the are detected as 2 GPUs in the test. I have tried to observe both GPUs usage via afterburner and it seem the utilization is bouncing between both GPUs but the usage is not at the same time.

5,581 views 3 replies
Reply #1 from AshesoftheSingularity Forums Top

If you have steam FPS counter enabled disable it.  Afterburner overlay could also cause problems.

That beign said I had exactly the same behavior. The steam FPS counter was the problem but even with that fixed my CPU framerate and GPU framerate are pretty much matched at 45 FPS.

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2xR9 290 watercooled

Reply #2 from AshesoftheSingularity Forums Top

I don't have much to add but double check Crossfire is (still) disabled. It is incompatible with DirectX 12 mGPU. It sounds like you've done this but just in case!

Sins of a Solar Empire: Rebellion
Reply #3 from AshesoftheSingularity Forums Top

It could be the benchmark requires fine tuning, I am singing consistent FPS usage for both GPUs in a regular game now.  Pretty cool I can run Crazy details at high FPS now on my 290x GPUs.