As far as AMD being behind - if they can manage to get a hold of a manufacturing process more suited for a high-end desktop chip, they'll most likely easily close the frequency gap. Clock for clock, ryzen and intel are pretty much equal at the moment.
Finally, if you're buying for X4... you're not in a hurry
Up to 5ghz should be doable with a single GPU and a good ~500w PSU... and that's for synthetic benches - power draw in gaming workloads should be waaay lessOmegaKnight wrote: At stock speeds yes
but if you plan to overclock then power consumption can go northward very quickly
extreme example