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High Quality Content by WIKIPEDIA articles! The Cray XD1 is an entry-level supercomputer range, made by Cray Inc. The XD1 uses AMD Opteron 64-bit CPUs, and utilizes the Direct Connect Architecture over HyperTransport to remove the bottleneck at the PCI and contention at the memory. The MPI latency is that of Infiniband, and 1/30 that of Gigabit Ethernet. 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.