I'm thinking @GeorgeK might know the answer to this as you also have an eGPU setup if I remember correctly? I currently have a Dell XPS 13 (I think 9370) which I link up to a 1080Ti in an eGPU enclosure when I'm at home. Since the iGPU of the 9370 is basically nothing, the 1080Ti takes over when connected. My question is: what happens if a laptop with a discrete GPU is connected (e.g. a 1060)? Do the GPUs combine their power, functioning in some form of SLI, or does the laptop revert to the 1080Ti? Thanks to all replies in advance!
You may want to give a shout to @David too, I think he has/had an eGPU at some point. If he hasn't then, well, it's not the worse rumour i've started about him
@Pete J Not me I'm afraid @adidan I think you're right, I thought it was @David too. If I were to guess, I'd suspect that either the external GPU would take over or perhaps you could select the GPU in the nvidia control panel. I can't see them working in SLI but then, as I said, I am just guessing.
I had a an XPS 15 9570, which had a GTX1050, plugged into an eGPU GTX 1070. The Laptop will revert to the eGPU. The TB3 system will allow you to choose between the GPUs but does not let you combine them. TBH, the bandwidth for SLI isn't there yet, especially considering the system overhead required for connecting to an eGPU over TB3.
You can also set what GPU apps use should you rather use one card vs another, I do this for battery life on the laptop when igpu is good enough. https://www.howtogeek.com/351522/how-to-choose-which-gpu-a-game-uses-on-windows-10/
Perfect, thanks for the answer. Maybe I was getting confused with DX12 then - I think I remember that was supposed to have something in the works for multi GPU tasks.
