Not so sure, many of the impressive A64FX numbers were published with no source code changes. Even large complex codes like WRF (a weather simulator) "just wor

Not so sure, many of the impressive A64FX numbers were published with no source code changes. Even large complex codes like WRF (a weather simulator) "just works" and was faster than a dual socket Xeon 8168 (each Xeon 8168 is $5680 each list). For another F90 benchmark (Himeno) they got 4 times faster than a dual Xeon 8168 AND 1.1x faster than a Tesla V100 running the CUDA version of the same benchmark. IMO that's pretty amazing, no source code changes and you get BETTER than GPU performance without having to rewrite your code. So sure a standard Epyc or Skylake refresh will run your code and "just work", the a64fx opens up the possibility of significant performance upgrades with no source code changes. If your code isn't currently rewritten for CUDA getting 10x the bandwidth and 4x the CPU performance would be really attractive.