Can I use an M2 SATA in an NVMe slot

What does the X4 mean in an PCIe Gen X4 NVME drive? m2 nvme slot This video explains how to select which slot to use on a motherboard for the best storage m2 expansion slot 2 slots are backward compatible so there is no need to worry about purchasing the wrong expansion card or NVMe SSD But you might want to save a buck or two by

m2 nvme slot A HHHL NVMe solid-state drive card is easy to insert into a PCIe slot of a server ), uses a NVMe solid-state drive computer bus Interfaces