Does your iPhone 6s or iPhone 6s Plus come outfitted with Samsung or TSMC-built A9 processor? The answer to that question could determine how long your device will run before its battery needs recharging.
Your key takeaway is this: while the dual-sourced chips perform identically in synthetic Geekbench tests in terms of sheer CPU compute power and GPU performance, there's a marked difference in observed battery life ranging from six to eleven percent.
You could argue the difference is barely felt in day-to-day use, but I beg to differ: energy efficiency is paramount for mobile devices and the battery-friendlier the main processor is, the longer it will run on a single charge.