Hi Hellmut,
It is very difficult to get top capturing performance on SLI setups. Let me explain why.
In SLI mode AFR is used (Alternate Frame Rendering) on multiple GPUs. Since we encode video using one GPU we must transfer the frames from one GPU to another. This creates a big performance hit! In SDR we have a better algorithm then in HDR since we need to transfer 2x less data (SDR is 8bpp and HDR is 16bpp).
What we would like to achieve is to get HDR SLI performance close to SDR SLI. We know that HDR SLI su** and we are not proud of it
We could make it better but we would need to disable all camera/overlay graphics composition so you would only get video.
Best,
Paul