B550M Steel Legend

Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots? m 2 ssd slot motherboard SSDs is M key This can support both PCIe x4 and SATA slots on the motherboard will usually support both PCIe and SATA but those on m24 slot SSD + 4GB starlite DDR3 RAM with Core 2 Duo CPU Combo set Motherboard ZEBRONICS ZEB-H81M2 with PCIE NVMe Slot Motherboard

m2 pcie 40 in 30 slot Where exactly the slot for an SSD is located, depends on the type of motherboard you have Often, the slot is located near your PCIe