HP want servers with ARM cpus, claims Bloomberg. The company would together with Calxeda are working on chips for the servers. ARM processors are indeed effective lwa nter, but generally much less powerful than x86 cpus.
ARM cpus are much more energy-efficient, but less powerful than x86 cpus. For that reason, they are until now mainly used in devices where energy efficiency is more important than performance. The solution is to have a large number of cores. This is how it works Calxeda to a way of 120 quad-core-ARM-cpu’s to work together, allowing a server on 480 cores might have.