Yeah usually it’ll still use your dGPU to render, but the frames still have to go back through the iGPU, so there’s a fair bit of overhead compared to plugging straight into the dGPU. I’d imagine it might also increase CPU usage too, as it has to coordinate transfering frames between 2 GPUs.
Don’t modern mobos share with the GPU anyway?
Yeah usually it’ll still use your dGPU to render, but the frames still have to go back through the iGPU, so there’s a fair bit of overhead compared to plugging straight into the dGPU. I’d imagine it might also increase CPU usage too, as it has to coordinate transfering frames between 2 GPUs.