The point is that Nokia bought A8s (actually the OMAP system-on-a-chip) designed for 600MHz and designed their motherboard, heat-disipation system etc. around that frequency, as sjgadsby said. You linked to the arm.com site to say that sjgadsby was wrong, but it is you who are wrong, as you misinterpreted the arm.com text. Yeah, yeah, I know: Of course, some people may be able to overclock (I don't know the percentages), but if Flash 10.x requires a higher frequency CPU then Nokia won't release it on the N900, i.e. Nokia won't force people to exceed the designed specs. Of course, that doesn't mean that people cannot overclock and try to hack 10.1 onto the N900 anyway, just that it means it probably won't come from Nokia, if the claim that it requires a faster CPU is correct.