The HP ProLiant Moonshot servers run on Intel Atom S1200 SoCs (at least at first), which are designed to facilitate efficiency and better density than ever for web workloads. Intel boasts that the Atom S1200 family of chips are the “industry’s only available 64-bit SoC with critical data center class features such as full 64-bit software ecosystem support, ECC and Intel Virtualization Technology“ that still falls within a 6W TDP. The Atom chips also help the ProLiant servers drop into any environment without the need for any porting.
ARM will get to 64 bit, but the thing is that by the time they do, Intel will have the answer for whatever they introduce. Again, people need to understand that the server space that ARM is fighting for is a TINY piece of the server pie. Analysts make it sound like ARM could make a big dent in Intel's Global server revenues which is just asinine, not to mention deceptive.