What is the Form Factor?

Here is my dilemma My ASUS Z790 Prime P Mobo has Three slots Here are the specs: Intel® 13th and 12th Gen processors: _1 slot (Key

B-key interface can support SATA bus standard and PCI-E bus standard, and it may support AHCI protocol or NVMe protocol M-key interface

m2 pcie slot A 4 lane NVMe SSD will have twice the bandwidth than a 2 lane NVMe SSD Most 4 lane NVMe SSDs have one key, unlike the SATA SSDs which

m2 slot screw 2x slots M2_1 slot Supports up to PCIe x4 Supports 2242 2260 2280 storage devices M2_2 slot