The XD1 was originally designed by OctigaBay Systems Corp. of Vancouver, Canada as the OctigaBay 12K system. The company was acquired by Cray Inc. in February 2004.
Announced on 4 October 2004, the Cray XD1 range incorporate XilinxVirtex-II ProFPGAs 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.