According to our sources, the yields of Zen 2 are enhancing quickly. Three months ago we wrote that Zen 2 yields (100% fully working chip) were about 70%. Today, yields are about 85%!
Zen 2 yields are still a little bit lower than Zeppelin ones (Today at +90%), but at this rate Zen 2 will be inexpensive to produce. TSMC 7nm yields are near 16nm yields (Source), and 7nm wafer cost is now under 10k Dollar (IBS Research).