@duerer I don’t understand those Error messages, I just look for something I can read and see: …too many instructions…(which probably is a RAM issue, not specifically a NVidia problem.)
I think it’s a problem with mixing Shaders (see also answer below), when a Principled Shader is like a Node Group that uses 5 Mix Shaders, then mixing two Principled Shaders means you’ve got 11 Mix Shaders!
