https://www.techpowerup.com/255008/amd-x570-chipset-to-feature-40-pcie-4-0-lanes
 
As we gear up for launch of AMD-s Ryzen 3000 series, details are bound to come up with increasing frequency. One of the latest, regarding AMD's in-house developed X570 chipset, which brings a renewed feature set to the AM4 platform, pertains to its PCIe lanes. AMD has included a grand total of 40 PCIe 4.0 lanes on the chipset, which will be distributed between PCIe uplink, USB 3.1 Gen2, USB 2.0 and SATA, as the spec sheet below (which may not be real) indicates. That's a whole load of bandwidth for the PC platform, not counting those PCIe lanes that are to be provided by the Ryzen CPUs.
 
It seems AMD will be using PCIe support level as a differentiator factor for its chipsets. The X570 is reported to be the only chipset to feature PCIe 4.0 support, while all other chipsets below it (B550 and so on) will only support PCIe 3.0. These lower-end chipsets should be manufactured by ASMedia.

Its looking like this will be my 1st AMD build in 15 years. Can't wait to see some mobo reviews for x570.

@atfrico Rig 2 in my sig has got to go, I feel ya, but the Enthoo Primo and it's water cooled setup stays 360 monsta below & 420 XT45 up top all push/pull which should be perfect for a cool Zen 2  and yet to be determined GPU. Here's hoping Navi is all that but I suspect we'll have to wait til 2020 for the high-end navi.  

I'm going to wait for the 3850X to release if the rumors about that one turn out to be true (16/32 5.1ghz).  I figure by the time that one releases, all the mobo reviews will be out and some of the initial release querks will hopefully be smoothed over.