Funnily enough, it looks like AMD actually are going to implement a multi-core GPU solution with Navi where the scaling is seamless (no Crossfire/SLI garbage; software/the OS/games etc. will see it as a single GPU), at least based on everything we've learned up to this point (chiplets, scalable architecture as referenced in their roadmap where Navi was first mentioned, and the recent talk from Norrod at HPC) so the idea of actual multi-core GPUs that actually work (unlike the lackluster performance and lacking compatibility of SLI/Crossfire) should become a reality this year.