how to tell how many nvme drive slots a motherboard has?

Which M2 SSD Slot Should I Use? what slot does nvme use x4 NVMe SSDs directly use PCIe bus protocol, and so can be directly plugged into a full-size PCIe slot using a simple passive adapter But what is ll slot book SSDs for the slot utilize the NVMe transfer protocol , which uses PCIe for transfer This is why they are also

what is the 5 slot machine strategy_ NVMe is a communication protocol designed specifically to work with flash memory using the PCIe interface NVMe