AsRock A620M-HDV/M.2

... In addition, Asrock only soldered on two SATA 6G ports for hard drives and older optical drives. The reason for this is the manufacturer's decision to connect the second M.2 slot via the A620 chipset rather than the processor. This has the advantage that M.2 SSDs with a SATA interface can also run in it, but the disadvantage that it is connected to the chipset with only two PCIe 3.0 lanes...