Samsung on Wednesday raised the bar for mobile chips with a preview of new Exynos 5250 chips. The dual-core design is the first based on the ARM Cortex-A15 and, through the 32 nanometer process and other optimizations, should be much faster than an ARM Cortex-A9. Samsung estimates that a 2GHz Exynos 5250 is twice as fast as a 1.5GHz A9 design without having to jump to quad-core.