EDIT: the HTC HD will have a 562Mhz CPU, not way faster, but faster than what we have seen from IT devices so far. The key is to understand that with mobile devices, fast CPUs are nothing if the system cannot take advanage of it. WinMobile needs a fast CPU for many tasks because of how its built. If HTC is keeping the ability of the process to scale, then that max speed rating is just max, not consistent.