Will a M+B key 8x Sata card work in a M key socket?

Lo slot utilizza un controller SATA, purtroppo non un PCIe quindi quel SSD da te linkato va bene, infatti proprio quello, taglio da 512GB,

2 standard contains variants with up to four PCIe lanes, one SATA 6 Gbs and or one USB port So it is possible to connect PCIe as well as SATA SSDs

m2 slot screw is a new form of connectivity that allows a SSD to connect directly to the PCI-E bus rather than going through a SATA controller By

m2_1 slot Some motherboards' slots may even support solely SATA bandwidth, which greatly limits your choice of SSDs but makes your choice of slot