MSI B660 boards M2 slots

m 2 motherboard slot   Dan m2 slot mainboard

Yes 8x = 16x Its not stated in motherboard manuals because it isn't a motherboard limitation, the limitation is on the CPU You need to

Support 2-DIMM DDR4-1866213324002666 up to 32G maximum capacity; Support 12 x PCIe slots; Support Connector; Support HDMI Connector PDF An slot is a type of connector found on some motherboards that is used to connect devices, such as solid-state drives

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