What are the top uses of PCIe x1 Slots?

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adding a mini PCIe card or rather an mSATA SSD, however couldn't really find any specs for the mini PCIe slot except it's a 52 pins

In other words, white to green, green to white 2) The x1 daughter board uses all 8 wires but PCIe mini daughter board only uses 7 Thus the The Advantage · Enables all types of full-length mini PCI Express cards to fit into a standard PCI Express card slot · Includes both a full and low

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