Motherboards - Micro-ATX PCIe slots

What is a PCIe SSD? pcie slot sizes This platform provides you with a compact 4u, 500mm deep rack mountable environment for twenty full sized PCIe cards With high power density and optimized pcieslot Pad, NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4 x8 x16 Slot : : Computers &

pcie 3 slot 16x is physical slot size, that is capable of wiring up to 16 PCIe lanes, but on your motherboard that slot has only 4 lanes connected to it