User harbinger2nd answers this question best: "Why hasn't Epyc grown faster? What makes its market share growth inevitable, and what will validate/invalidate that?" I'll address this point because its something I as a long term bull have had to come to terms with as well. The truth of the matter is, as I've been able to discern, simply an issue of time. In the server industry validation required extended time frames in order for sufficient testing to be performed. When you're dealing with server hardware even a 10 minute blip of downtime can cause millions of dollars of loss. As $AMD is re-entering the market with a brand new architecture their validation will be subjected to the harshest conditions over the longest time frame. This was exacerbated by the discovery of spectre/meltdown in early june of 2017, coincidentally the exact same time AMD announced its EPYC lineup. It is my opinion that the discovery of spectre/meltdown added to the validation time frame of an already lengthy process. Having watched the validation process unfold there are tiers to the process. You have the Super Seven cloud providers: Facebook, Google, Microsoft, Amazon, Baidu, Alibaba, and Tencent which all have direct access to AMD and the teams necessary for their own validation process. These guys had first access to AMD's chips since they are an end user and the turnaround should be the quickest if they like what they see. Next you have the big OEM's: Dell, HP, and Lenovo. Each of these companies does their own validation which can take up to 6 months and then start selling small samples to their own customer bases who then do their own validation which can take up to another 6 months. Once AMD has been reestablished in the server space and customers can start trusting their tech again the turnaround time will decrease by a substantial margin (such as what you see with intel). Right now though, AMD is stuck in purgatory while everyone and their grandma validates their systems. Hope is just around the corner though as AMD management has said that 2H 2018 will be an inflection point for EPYC and the response from everyone validating EPYC has been overwhelmingly positive. $AMD, Advanced Micro Devices, Inc. / H1