The most recent Top 500 supercomputer list still features 2 or 3 PowerPC systems in the top 5, though the number Intel-based systems continue to grow. The #1 system, Road Runner, actually raises an interesting question about how to count “processor architecture,” since it uses both AMD Opteron and IBM Cell processors. The other two PowerPC systems in the top 5 are both BlueGene installations, which use large numbers of embedded processors built around IBM’s PowerPC 440 and 450 cores.

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