Don't let the Hitachi 200Mhz CPU freak you out. The CPU in the Dreamcast is an SH4 CPU using the RISC architecture, and can't be compared to PC technology Mhz by Mhz.
It's been said that it's comparable to a 300Mhz PC, but I disagree - I'd place it somewhere a bit higher than that. It's all speculative anyway.
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