Although the Galaxy Note 4 has been officially announced, Samsung has been mum on details about the Exynos chip that will be powering the phablet in some countries. Our own sources had earlier confirmed that it would be the Exynos 5433; there were rumors that the 5433 would use ARM's new Cortex-A57 and A53 cores, but there were also many indications that it would use the standard Cortex-A15 and A7 cores. However, according to AnandTech, the Exynos 5433 will indeed use the newer Cortex cores, and it will also feature 64-bit support.
64-bit support might be disabled though, which AnandTech believes could be the reason Samsung isn't marketing the 5433 as a completely new chip. Apparently, there is an Exynos 7 series of chips Samsung is busy designing, a series that will be the first to be marketed as a 64-bit capable chipset. However, while it might not offer 64-bit processing (at least not until Android L comes knocking), the Exynos 5433 will offer the advantages of the new Cortex-A57 and A53 cores, including reduced power consumption, partly due to Samsung's new 20nm process.
The Exynos 5433 is also expected to feature the Mali T760 GPU, the most high-end chip in ARM's Mali GPU lineup, clocked at a whopping 700 MHz (the Snapdragon 805 has a GPU running at 600 MHz.) This means that we can expect the Exynos 5433 to break quite a few performance records, something we've already glimpsed through leaked benchmarks, and now it's just a matter of time before Samsung makes its latest Exynos chip official along with details on exactly when the Exynos-powered Galaxy Note 4 will go on sale.