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Summary form only given. Multi-core technologies, application specific accelerators and fault tolerance requirements are defining a new hardware basis for high performance computing systems. Multi-core will make evolve parallelism from a niche product in HPC to the standard programming model and, therefore, trigger new developments in languages, environments and tools. Accelerators and dynamic system behaviour from fault tolerance will make virtualization techniques necessary to support programmability. Energy efficiency as a new optimization target for HPCN systems will force future systems to bring all of these techniques together.