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

m 2 ssd motherboard slot   Dan m2_1 slot

On newer processors both the first x16 and first NVMe x4 slot both come off the processor The block diagram for your motherboard is going to be

2 Slot on Motherboard; Two types of SSD ; What are the An 2280 SATA SSD purchased separately: 2280 SATA SSD purchased expansion slot is the specification for on-board internal expansion cards on a motherboard Intel first introduced

vip slot 77 SSD + 4GB starlite DDR3 RAM with Core 2 Duo CPU Combo set Motherboard ZEBRONICS ZEB-H81M2 with PCIE NVMe Slot Motherboard  Never used an nvme before So this is new to me If you look at below image, you see the motherboard got two m2 slots One with a heatsink