Silver Lining Systems puts AMD’s ARM server in a different class
semiaccurate.com
semiaccurate.com
Considering that Calxeda is the only one making the fabric, and Calxeda is the only one using these ARM chips in general, I'd say its a killer feature (specifically: a killer feature for Calxeda-ARM motherboards, not for any other manufacturer of ARM chips). And since AMD is partnering with Calxeda here, they get the benefit.
AMD is also the only big-player that has big-ARM chips out in any volume right now anyway. I know there are a few from China but nothing really standardized.
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In any case, Xeon-D and Atom Centerton are kicking some major ass in power/performance benchmarks. I find it unlikely that the AMD chip will keep up with Intel. Still, being the only major ARM-server manufacturer is a good position to be in.
IIRC, these AMD chips are Seattle, which is 28nm (two nodes behind Intel). AMD is still hopelessly behind Intel. AMD is hoping that Zen-ARM chips will catch up in 2017.
So basically... I bet this is mostly for R&D and experimental deployments. Because if you're really deploying a multi-million dollar data-center full of computers, you want the best. And the best, for better or worse right now, is the Xeon-D.
If you want to start experimenting with ARM server development, it looks like these AMD Seattle chips are the best ones on the market, with a very intriguing implementation with Calxeda's motherboards / switching fabric as well. If Calxeda / AMD undercuts Xeon-D with cheaper chips, they probably can win with I/O heavy workloads (video hosting, cloud storage, etc. etc.)
Rumor is that these Seattle chips have 14-SATA ports (!!!!) and on-chip Gigabit-Ethernet, so AMD is definitely targeting those I/O heavy workloads.