The chip itself has 16 available PCI 3.0 lanes. Configurations are likely to be 1x8, 1x4, 1x4, 2x4, 1x4, 1x4 with the first the lanes dedicated to the external VGA cards, the second to NVME and the third to other. The chipset then will follow its specification: if it's a B550 it wil likely have 4x general purpose PCI 3.0 lanes and either 2 additional PCI3.0 lanes or 2 SATA lines. The APU has 4 less PCI lanes than a 3000 series CPU, so it will not have the full 1x16 or 2x8 configuration for graphics cards and the lanes from CPU are 3.0 instead of 4.0 because of the mobile power requirements. BTW, if a motherboard maker reports incorrect information, or it refers to a future unannounced product, I don't see how AMD is to blame. What these APUs are capable of, and what they aren't capable of, was clear since day 1 of the architecture description.