MSI B660 boards M2 slots

This riser card is an slot protection card Support key full pin definition 1-to-1 connection Support PCIE GEN4 SSD

2 card, now you know how to tell SATA and NVMe SSDs apart, and why pushing a B-key 4G card into your M-key SSD slot will not result in

m24 slot , pronounced m dot two and formerly known as the Next Generation Form Factor , is a specification for internally mounted computer expansion cards

m2 sata slot NVMe cards, as you probably are aware, require an M key slot even through they're electrically similar to E key, save for the extra 2 lanes