writes "HP's server design packs 288 Calxeda chips into a 4U rack-mount server, or 2,800 in a full rack, with a shared power, cooling, and management infrastructure. By eliminating much of the cabling and switching devices used in traditional servers and using the low-power ARM processors, HP says it can reduce both power and space requirements dramatically.
The Redstone platform uses a 4U (7-inch) rack-mount server chassis. Inside, HP has put 72 small server boards, each with four Calxeda processors, 4GB of RAM and 4MB of L2 cache. Each processor, based on the ARM Cortex-A9 design, runs at 1.4GHz and has its own 80 gigabit cross-bar switch built into the chip"Link to Original Source