mini pcie slots - Adding a Second Ethernet Port to an Intel NUC via Mini PCIe - ... slot mega 888

The first four generations of NUC motherboards sported two Mini PCIe slots: One full length slot on top for mSATA SSDs and another half-length slot below, ostensibly for a Wi-Fi card.

Answer (1 of 4): Mini PCIe cards are also PCIe devices but they’re produced for laptop uses. So you need to buy a PCIe card which has Mini PCIe slot. Also you can put Mini PCIe cards to secondary nvme card slots but you need to be sure that it works with non ssd devices.

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