So the slower one has 4xA7. Those are branded as "ultra high efficiency" cores. In other words, absolutely useless in this application. Probably ok for running the logic that runs a microwave oven.
The faster one has a couple of A72's and a couple of A53s. So think of that as a DUAL core A72 that has a lower power mode. While the A72's are interesting, the big.little concept really has no place in a car head unit, since you have effectively unlimited power to run them. Also note that just because they are A72's doesn't mean that rockchip's implementation will perform decently -- they seem pretty good at getting REALLY crap performance out of their hardware. For instance, SPECIFICATION wise, the RK3188 should be nearly equal to a Snapdragon 600 (I would say within about 20%). Yet the Snapdragon 600 will make a make a COMPLETE FOOL of the RK3188 -- there is simply no comparison.
I would judge that this RK3399 will NOT be at all impressive when compared with the Intel x3-C3230RK that is currently being used in head units. It might be *similar* in overall performance, but the stability will be poor like the RK30xx/31xx, and they'll hoard the source as they always do. At least with the Intel, despite being manufactured in partnership with rockchip, the needed source code is available.
