It might be running at a somewhat higher frequency, because why not. But the DTK is not a production model, so I don't expect Apple to spend significant resources on it. After all the A12Z should be good enough as-is.
You have to consider that Apple engineers are busy designing new SoCs for the entire Mac line-up: optimizing the A12Z for the DTK is probably not their top priority at the moment. They will want to wow people with a new MacBook (Air? Pro? <blank>?) this fall: that SoC should be their priority...
You have to consider that Apple engineers are busy designing new SoCs for the entire Mac line-up: optimizing the A12Z for the DTK is probably not their top priority at the moment. They will want to wow people with a new MacBook (Air? Pro? <blank>?) this fall: that SoC should be their priority...