Which is faster an slot or PCI-E slots for an drive?

NVME M2 drives: which slot to use? m2 expansion slot , pronounced m dot two and formerly known as the Next Generation Form Factor , is a specification for internally mounted computer expansion cards m2 nvme slot 2, also known as NGFF is the successor of the mSATA standard for expansion cards 1x 2280 NVMe slot and 1x 2230 NVMe

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