Editing Cray XD1

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The '''Cray XD1''' was an entry-level [[supercomputer]] range, made by [[Cray Inc.]]

The XD1 uses [[AMD Opteron]] [[64-bit]] [[central processing unit|CPU]]s, and utilizes the [[Direct Connect Architecture]] over [[HyperTransport]] to remove the [[Von Neumann architecture|bottleneck]] at the [[Peripheral Component Interconnect|PCI]] and [[Resource contention|contention]] at the [[primary storage|memory]]. The [[Message Passing Interface|MPI]] [[Latency (engineering)|latency]] is ¼ that of [[Infiniband]], and 1/30 that of [[Gigabit Ethernet]].

The XD1 was originally designed by OctigaBay Systems Corp. of [[Vancouver]], British Columbia, 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 [[Xilinx]] [[Virtex-II Pro]] [[Field-programmable gate array|FPGA]]s 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 (computing)|load balancing]] / resource management system is an enhanced version of [[Sun Microsystems]]' [[Sun Grid Engine]].

==External links==
* [https://web.archive.org/web/20080918225847/http://www.cray.com/products/Legacy.aspx Cray Legacy Products]

{{Cray computers}}

[[Category:Cray products|Xd1]]
[[Category:X86 supercomputers]]


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