The X670E boards are interesting, as they seem most useful in the productivity/creator space for those who don't want to quite step up to Threadripper. If you are gaming primarily, it is probably better to stick to 8 cores or less and get the 3D cache versions of the chips. None of that would require the massive amperage the VRMs can deliver. That would only be useful in getting clock speeds up on highly threaded workloads on the 12 and 16 core chips.
Likewise, that extra PCIe graphics port doesn't do much for gaming. Crossfire and SLI died with DX11, and Vulkan and DX12 games are rarely implementing any sort of multiGPU functionality. So it really again only helps with benchmark leaderboards or certain scientific productivity software,
