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Last updated: January 11th, 2016 at 16:37 UTC+01:00
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As opposed to the Exynos 7 Octa (7420), the Exynos 8 Octa has a 30% better performance and a 10% more efficient energy consumption. It's an octa core processor from which 4 cores take the big load off whereas the remaining 4 cores and smaller and are meant to make the chip more efficient. This is what Samsung calls Heterogeneous Multi-Processing or HMP Solutions for short, which is a system for using the big cores and the little cores in an optimal combination. What's more is that the 14nm FinFET technology uses a 3D transistor setting in order to increase performance and decrease chip size, and that's where the term “14nm” comes from: electrons normally travel one way (20nm) in a 2D transistor build whereas in a 3D transistor scheme the electrons travel in three ways (14nm travel distance).
Regarding connectivity, the Exynos 8 Octa supports category 12 for downlink and category 13 for uplink so it's a very efficient chipset from this point of view. What's more is that its 3D performance can deliver PC or console-like gaming experience and the chip also has a very high resolution display support with four times as much detail as Full HD (4,096 x 2,160 pixels as opposed to 1,920 x 1,080)
Check out the infographic below to get a better idea of just how good this SoC is.