ARM's latest CPUs push Android phone makers toward 64-bit only devices

ARM just sent a not-so-subtle warning to Android phone makers still hanging on to 32-bit technology. The company has introduced its first lineup of CPU core designs that are exclusively 64-bit -- unlike last year, there's no legacy tech for vendors to use. The Cortex-X4, Cortex-A720 and Cortex-A520 don't always represent major leaps in performance, but they're likely to set the pace for Android in the near future. The Cortex-X4, like the X3, is a performance core aimed at flagship phones. Its up...