Samsung has announced its upcoming Galaxy Note 4 phablet will be available in 2 processor versions, one will come with Qualcomm's Snapdragon 805 (32-bit chip) clocked at 2.7GHz, while the other one will sport Samsung's Exynos 5433 octa-core chip. The latter caused a lot of confusion lately considering Samsung didn't exactly release the full details when it comes to this chip, up until now that is.
Samsung has released a new source code which confirms that Exynos 5433 is indeed the first Cortex A57/A57 SoC on the market. Samsung caused a lot of confusion when it comes to this, not only because they didn't release full details of this chip but because they didn't market it as a 64-bit chip (even though some people assumed it is considering it will be employed to power the Note 4). This seems kind of odd for this Korean giant, marketing is what they do best and it's weird they didn't brag about it from the get-go. So, why didn't Samsung market this as a 64-bit chip? This could be due to the fact Exynos 5433 will never run in AArch64 mode. This processor will take advantage of ARM's Cortex A57 and A53 cores and their ARMv8 instruction set (which actually run in AArch32 mode). Power consumption should also see some improvements due to A50's power management. The silicon is manufactured on Samsung's new 20nm process, just like in Exynos 5430. This chip comes with Mali T760 GPU which is running at 700MHz, we still don't know how many cores this GPU is running at though. You can check out Samsung's Exynos 5 Octa lineup for this year in an image down below.
There you have it. Exynos 7420 is expected to be featured in the next high-end device Samsung releases, probably the Galaxy S6 next year. That chip will run in AArch64 mode with Android "L". We still don't know the details of this chip but I hope we'll start putting pieces of the puzzle together in the coming months as details start leaking out. Samsung probably could have employ Exynos 5433 as a full-fledged 64-bit chip in the Note 4 but didn't want to do that because then it would have 2 versions of the Note 4 running on completely different architectures. That's just a guess on my part though. Snapdragon 810 (64-bit chip) will be released in Q1 of 2015 and then we expect the majority of manufacturers to start including 64-bit chips in their smartphone offerings.