Page "Cray XD1" Paragraph 3

Announced on 4 October 2004, the Cray XD1 range incorporate Xilinx Virtex-II Pro FPGAs for application acceleration.

With 12 CPUs in a chassis, and up to 12 chassis installable in a rack, XD1 systems may hold several 144-CPU multiples in multirack configurations.

The operating system used on the XD1 is a customized version of Linux, and the machine's load balancing / resource management system is an enhanced version of Sun Microsystems ' Sun Grid Engine.