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Today's HPC clusters are a far cry from the first systems that changed the computing industry. Achieving optimal performance and productivity from an HPC cluster requires much more than racks of servers and Gigabit Ethernet. Indeed, the design challenges have increased dramatically due to the introduction of multi-core processors and 20 Gbits/sec InfiniBand technologies. With introduction of high performance quad-core processors from AMD, the dual socket (eight core) node is now the "standard" building block of a modern cluster.
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