That's correct, however, considering that Zen 2 supports PCI-E 4.0, that's double the bandwidth of the previous generation, it means that those multiplexed 4x can theoretically now support double the bandwidth of the previous generation 4x and it's not like the "stuff" that does get multiplexed over that 4x (USB, SATA, some 1x cards like sound, wifi and ethernet) also suddenly needs twice the bandwidth meaning that in practice, that 4x works as an 8x in Zen 2 motherboards. Great deal I say :)
