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HP, Palo Alto, is working with Austin, Texas-based Calxeda, which came out of stealth mode last year. Calxeda's ARM processors use 32-bit technology.
Like Dell, HP is using its ARM-based servers as a test and development platform for partners looking to develop low-power, high-density server applications.
Each Marvell-based 64-bit ARM server consumes about 15 Watts of power compared to about 5 Watts for a Calxeda-based 32-bit ARM server.