In the Condensed Matter group at Sissa we developed a certain number of parallel codes that are now routinely used to perform scientific research in computational condensed matter physics. The target machines of these scientific packages have been T3E and SGI Origin-2000 for almost three years. Recently we started some experiments with a Beowulf class machine locally developed. In this paper we briefly describe our machine and we show the behavior of a representative suite of these scientific parallel codes on our prototype. We compare the performances achieved on our Beowulf Cluster against results obtained on the SGI parallel machines used so far. The differences in performances are discussed with respect to the computational characteristics of the codes. We will show that none of the architectures considered fits all the requirements of our suite of codes, but specific machines can address specific problems
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