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First Generation Xbox 360 Games using Single Thread?

Inquirer is spreading speculation that the first generation of Xbox 360 games are only using a single thread out of the six available on the CPU. Take it with a grain of salt until Microsoft confirms or denies it directly.

During a talk on multithreaded programming, Microsoft used the three core, two thread per core Xbox360 as an example. The bombshell was that the first generation of Xbox titles, all of them, are single threaded. Not good.