ARM is an open mind company, they are willing to provide all knowledge to any customers. Compared to ARM, Intel is a miser.They used all kinds of political issues to prevent others to share their apple. In the PC era stage, they successfully kick out all competitors. But its drawback is obviously showing up at mobile phone time. This is the bittermelon Intel must pay now.
And where can you buy a 64 bit Atom server? Nowhere. In fact, Intel will be at least a year later to this market, as they won't have a real Atom server chip (64 bit) until 2015.
Not to mention that even for that generation their transistors are really 26nm, not 22nm.
Yes, there is a realtively small 32-b it ARM server market emerging this year with systems from a handful of little known players such as Boston Ltd. (Calxeda) and Mitac and Wiwynn (Marvell) and at least one large user TK soon.
But the big juice comes with 64 bit products in 2014.
What does the author mean by power efficiency? If the author means performance/watt, the ARM, too, is not as power efficiency as Xeon.
Both ARM/ATOM is good at absolutely power consumption instead of power efficiency.