Most of the current AMD offering, APU, GPU, and CPU is still being fabbed with GF 14nm, which I believe to be very limited in capacity. Once the next generation GPU ( Navi ) and CPU ( Zen 2 ) along with EPYC 2 moves to TSMC 7nm they should be able to flex their muscles a lot more.
I wished they have made the move earlier, like start of this year, but it is now all set for Q3.
Pure Speculation, judging from the slight delay ( 1Q ) in EPYC 2 introduction, my guess is that AMD wants the launch and fulfil all the demand of the big cloud provider ( AWS, Azure and Google ) while still have enough Chips for the rest of the market. The worst thing could happen is AMD announced their EPYC 2 and AWS getting all the stock with little left for other Channels.
I have high expectation but I trust Dr Lisa Su and her executive team. And Intel is currently having a new low in my book.