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

NVME SSD Not Showing Up in BIOS and Disk Management m2 nvme slot That board should have an NVMe slot for installing a PCIe Gen 3 drive Some m2 drives have a slot on the left, some on the right m2 sata vs nvme slot Chapter 5, page 34 indicates that there are two SSD slots The one on the right is for a secondary NVMe SSD

m2 nvme slot As people pointed out, your motherboard have only one PCIe NVMe capable slot So only one NVME drive natively for this board