Then you want a BeagleBoard or a PandaBoard. Cortex-A8 and Cortex-A9 CPUs at 1 GHz, respectively. And the latest versions include dual-core CPUs. Price is quite a bit more ($100 - $150 US) than an RPi ($25 US). But you also get a much more advanced CPU (ARM11 in the RPi vs ARMv7 in the others).
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