Onboard m2 slot or pcie m2 expantion card? which is faster?

In this article we will take a look at the different types of industrial motherboard expansion slots including PCIe, and Mini PCIe

expansion card that replaces the previous mSATA standard 2 slots for both types (SATA and NVMe drives are often keyed

m2 slot mainboard is a specification for internal expansion cards on PC mainboards and notebook computers was conceived as an successor of the mSATA interface and

m2 nvme slot PCI-SIG also authored standards for SSDs, which provides PCIe connectivity for small form factors and is designed for internally mounted expansion cards