Hi Chris
Thank you very much for the valuable info.
I also noticed that the GPU Load starts at 99%-100% but soon after it comes down to ~30%.
In the mean time, the CPU stays at 100% most of the time.
So my impression is also that the CPU is the bottleneck.
My feeling is that a dual CPU motherboard and two CPUs with significant more cores might boost the performance better than a second GPU. Would you agree with this ?