Right now there's just a lone benchmark result published: Apache. This benchmark is also for just a single 5-Watt Calxeda ARM server rather than one of their 192-core servers or any other crazy configuration.
The single Calxeda EnergyCore ECX-1000 is operating at 1.1GHz with 4GB of low-power DDR3-1066MHz memory, Gigabit Ethernet, and is attached to a 250GB SATA HDD. Ubuntu 12.04 LTS was running on the hardware.
Calxeda says the average power consumption was 5.26 Watts and for Apache delivered a 15x advantage over an Intel Xeon E3-1240 that had an average power consumption of 102 Watts.
The result and additional information was published to ARMServers.com.
If you didn't see already, be sure to check out the 12-Core ARM Cluster Benchmarked Against Intel Atom, Ivy Bridge, AMD Fusion results and Building A 96-Core Ubuntu ARM Solar-Powered Cluster.