M.2應該唔會有一開二,因為PCI-E係point to point connection。要分PCI-E就要用PCI-E switches,即係好似chipset咁,由CPU PCI-E入chipset再分好多組PCI-E出黎

One device each on each endpoint of each connection.

PCI Express switches can create multiple endpoints out of one endpoint to allow sharing one endpoint with multiple devices.

https://en.wikipedia.org/wiki/PCI_Express

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