There&#x27;s no argument that the Xeon server is going to be less power-efficient than the RP2 cluster.<p>Before you go out an order a bunch, do keep in mind that the RP2 cluster doesn&#x27;t support ECC memory and other features often considered necessary in a server environment, like remote management.  I&#x27;m pleased to see the A1100 does support ECC.<p>Still, it is an interesting test.  I look forward to reading more about ARM servers.  And I hope the Mill Computing guys will ship something eventually too.