 "Service" and "IO" PEs run the full version of SuSE Linux and are used for interactive logins, systems management, application compiling and job launch.I/O PEs use physically distinct hardware, in that the node boards include PCI-X slots for connections to Ethernet and Fibre Channel networks.Though the performance of each XT3 model will vary with the speed and number of processors installed, the November 2007 Top500 results for the Red Storm machine, the largest XT3 machine installed at Sandia, measured 102.7 teraflops on the Linpack benchmark, placing it at #6 on the list.