EPYC market share is mostly Cloud providers and hyperscalers. I assumed that these customers buy their servers directly from ODMs (or am I mistaken?). My point is that they wouldn't be using Dell or HPE servers, so the theory that EPYC sales were held up by lack of servers from big OEMs is false.
The 2018 uptake in the cloud was not as big as some people would assume. Many of the major ODMs would not even announce they were working on an AMD EPYC platform.
I can tell you, a smaller cloud player like a Packet is using the PowerEdge servers for their EPYC instances because the ODMs were not stepping up. When they were picking a model, Tyan did not have what they needed in 1P and Supermicro had been focused on 2P designs early, as was HPE. They went Dell because about a year ago they could not source what they wanted and Dell was first to market with what could work.
That type of experience was not uncommon.
In 2019, cloud providers will drive unit sales. In 2018, I heard over-and-over that lack of platform ecosystem was slowing trials and deployments.