[SOLVED] How can I select the GPU in Unreal?

I use a Nvidia Quadro P400 and a second GPU Nvidia Quadro RTX 4000. My Monitor is connected to the P400. When I start Unreal the performance is very weak. How can I tell Unreal to use the RTX GPU ? I even tried to start Epic Games launcher with “Render Open GL on:Nvidia Quadro RTX 4000” but same weak performance. I also tried to find any GPU settings inside Unreal - no luck so far.

Found it unreal 4 - ue4editor.exe GPU selection - Game Development Stack Exchange

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Seems not to work in each Case. Someone know how to see in Unreal Engine which GPU is used ?

Doesn’t it require the monitor to be connected to the RTX 4000?

I don’t think so.