Does any PCIe slot support NVMe SSD's automatically or do I need

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m2 pcie 40 in 30 slot An M2 PCIe SSD solid state drive storage slot on a motherboard, ssd in motherboard slot ssd in motherboard slot Stock Photo Hard disk SSD m2 on Why not a mix of NVMe + SATA III SSD? Add in cards to go in an empty PCIe slot 1 or 2 drives in one of those