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

m 2 motherboard slot   Dan m2 nvme slot

As its newest industrial motherboard, the ATX 22802242 M-Key x 2, 30423052 B-Key x 1 + Micro SIM Slot x 1, Mini PCIe x 1 + Micro SIM Slot x 1

2 drives aren't connected to a motherboard via a cable, they're instead plugged directly into the motherboard using a dedicated connector As its newest industrial motherboard, the ATX 22802242 M-Key x 2, 30423052 B-Key x 1 + Micro SIM Slot x 1, Mini PCIe x 1 + Micro SIM Slot x 1

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