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"What we found was with the CPU with planar transistors, when we went from 28 to 22, we actually started to slow down," he said, "because the pitch of the transistor had to become much finer, and basically we couldn't get as much oomph through the transistor."

The problem, he said, was that "our IDsat was unpleasant" at 22nm, referring to gate drain saturation current*. In addition, the chip's metal system needed to be scaled down to fit within the 22nm process, which increased resistance.

"So what we saw was the frequency just fall off the cliff," he said. "This is why it's so important to get to FinFET."

HD video playback is another strong point. CPU decoding of really high bitrate 1080p flash video is executed smoothly, albeit with the CPU cores dangerously close to maximum load. Normal bitrate 1080p video has the cores loaded to about 60 per cent, leaving a healthy amount of headroom.