Server marketshare has been fairly sticky -- despite AMD offering low-risk, same ISA migration, and attractive pricing, the server market was relatively slow to adopt Zen.
OTOH, new HPC systems have been quick to adopt Zen in the form of dual-socket EPYC nodes.
Actually if you look at the current top 10 supercomputers, only 2 are Intel. The rest are custom ARM or RISC CPUs (in Japan and China), IBM Power9, or AMD EPYC.
HPC is a special industry in that regard. HPC is know to take well managed technical risks such as building custom CPUs (A64FX in Fugaku) or using less popular architectures (SPARC, Power). If one can be certain that with enough coding hours codes can be adapted to run on those platforms and they will end up faster more exotic hardware will be bought or considered.
Nation level HPC projects are not conservative, Industrial HPC maybe a bit more so.
My take at this is because of inertia. I have a large fleet of servers that have been Intel since forever. I see no reason to migrate them today as things work reasonably well. We upgrade the hardware every 4-5 years. So during the next upgrade for sure I'll choose AMD, there is no question of that. ARM will be a serious competitor and RISC-V, too, that's for sure - but they are just not there yet when we talk about maximum performance (in our case, energy consumption is not the main concern)
I think this is largely just lag between orders for new xen parts and the capacity coming online. I would expect to see a lot of xen processors in fleets being built today.
> I think this is largely just lag between orders for new xen parts and the capacity coming online.
That may be a piece of it, but I think there's a little more.
AMD released the first generation of Epyc processors in June 2017. They didn't see much adoption for years.[1]
>the server market was relatively slow to adopt Zen.
Is this finally an accepted truth now? I have been banging on about it for years that AMD are not doing good enough on Server. They will still gain a little more market share with Zen 4, but now Intel is coming back. The perfect opportunity windows is closing down.
