NVMe - PCIe Lanes and Slot
You have to check the motherboard manual for details on specific layouts, just as a general note.
But, for X370/X470 generally, the boards with Two M.2 slots, one will run PCIe x4 while the other runs as SATA. In the Hero's case, one of the slots appears to only do PCIe, if I'm reading the manual correctly. https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_CROSSHAIR-VII-HERO_WI-FI/E13834_ROG_CROSSHAIR_VII_HERO_WI-FI_UM_WEB.pdf On page 24, you *can* run two NVMe PCIe SSDs in x4 mode at the same time, but the GPU slot drops to x8.
Ryzen CPUs have 24 PCIe lanes. x16 to the GPU slots; x4 to the NVMe slot; x2 to the Chipset features. It's the other x2 that seem to be the shared bandwidth for the SoC features and the x1 slots, I think. I've yet to find clarity on that point.
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