The Snapdragon 820 testing has reportedly been very rigorous, as Samsung wants to make sure there will be no overheating issues like with 810. Moreover, Snapdragon 820 has apparently been greenlit to go into Galaxy S7 models for select overseas markets, so the chipset must have passed the stringent testing pretty well. As to what has brought Samsung back to Qualcomm’s chips, after the 810 fiasco, is anyone’s guess, but probably has something to do with globetrotting LTE models, as nobody makes small and frugal LTE modems with record bands support count like Qualcomm just yet.
Galaxy S7 Exynos version benchmarked with 3GB RAM, 4GB reserved for 'LTE' model
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We’ve already been hearing through the grapevine that Samsung has accelerated the development process of its flagships with a few months, thanks to the implementation of new project management techniques, and the upside is that the chatter about the next-gen Galaxy S7 is starting as soon as this summer. Poised for development completion by year’s end, the Galaxy S7 has been testing with both Samsung’s own Exynos chipsets, and with Qualcomm’s Snapdragon 820, that much we’ve been tipped already.