I haven't been paying tremendously close attention to this line of CPUs, but I'm interested. I've seen indications that it's not particularly stable under Linux. Is that true? Is there a microcode update?
http://www.phoronix.com/scan.php?page=news_item&px=Ryzen-Seg...
As of now, nobody seems to be able to reproduce the high parallel load segfaults on epic or threadripper.
AMD says they can reproduce the problem on RyZen, and that it is not present in epic/threadripper.
Though hard freezes not during compilation should be a completely different issue, and it will be an effort to pinpoint the processor as responsible.
TR uses the same Zeppelin dies as Ryzen. Just the top 5% binned parts.
Epyc uses a newer die stepping that isn't yet used for Ryzen or TR.
http://agner.org/optimize/blog/read.php?i=838 "Test results for AMD Ryzen":
> The Ryzen is saving power quite aggressively. Unused units are clock gated, and the clock frequency is varying quite dramatically with the workload and the temperature. In my tests, I often saw a clock frequency as low as 8% of the nominal frequency in cases where disk access was the limiting factor, while the clock frequency could be as high as 114% of the nominal frequency after a very long sequence of CPU-intensive code. Such a high frequency cannot be obtained if all eight cores are active because of the increase in temperature.