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Two comparations -figures at the end of the article-; PVM vs. Mosix, a test battery of different applications with different runtimes, that proves that a Mosix outperforms PVM on a cluster; and running a molecular dynamics simulation of 1000000 atoms, on a Pentium Pro cluster with Ethernet, that proves that Mosix outperforms a SP/2. For 8 node, Mosix is 4 times faster than SP/2. When we use 16 nodes, we find again a bottleneck on the network layer, that can be easly broken using Fast Ethernet -A 30R$ communications card!!-. Mosix is a fully-competitive platform for CPU-bonded parallel tasks.