Just the transition to 4.0 has huge implications for mGPU and one thing AMD could do beyond CF is having a dedicated post process injection GPU die directly wired to the main GPU or even several of them designed in mind to do certain post process techniques very efficiently and well. The Ryzen I/O was a really clever thing from AMD that I see coming to GPU's quickly to do so much more.No reason not to with the Rome design. Infinity Fabric is based on PCIe signaling and speeding up the interconnect obviously has benefits. Secondly they only have to spin a new IO die to integrate the new standard without bothering with the chiplets if they arrive for consumers.