As I'm sure you know, the vanilla OMAP2420 has an ARM11@330MHz, MBX+VGP@50MHz and DSP@220MHz. Possibly this was just the configuration first demoed. OTOH the OMAP2420 product bulletin on the TI site states ARM11 at up to 1GHz, and of course there have been rumours of MBX+VGP@200MHz, giving AFAICS double the raw fill rate of Dreamcast - although I have to wonder what a handheld would do with such fill rate.