Then it all calms down and within a year a new PC is more powerful than them again. The marketing blather between the big companies ramps up to a degree that you believe that these machines can resurrect the dead and simulate walking on water to an unparalleled degree.
It's the same every console cycle – the new consoles come out and, for a time, there's a glory period where they at least seem more powerful than the average games PC or Mac.