expansion slots: what is socket 1, Key A and how many sl

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

The PEDET should be irrelevant It is pulled up by host and it selects between SATA and PCIe mode in Key M based on insertion of SATA or

m2 pcie slot Key IDs has 12 plug and socket key configurations to ensure that the motherboard supports the interface on the card The M and B keys are the most

m2 slot types Socket 2 with Key B and Key C show less , ECN, October 22, 2021 The new BGA pinout content is based on the Socket 3 Key-M definitions