Samsung Galaxy Note 4 will come with two versions. In addition to the Snapdragon 805 used by the Bank of China, there will also be Samsung's own Exynos 5433 version. Samsung did not release the details of this SoC. According to the foreign media Anandtech, they confirmed that Exynos 5433 did use the Cortex-A57 and Cortex-A53 cores from the source code.
From the table summarized by Anandtech, Exynos 5433 uses Cortex-A57, version r1p0. In terms of memory, only dual channels are used 32bit@825MHz Of course, we are still skeptical about this specification. The memory bandwidth of the Exynos 5422 used on the Galaxy S5 is 14.9GB/s, while the memory bandwidth of the recently launched Exynos 5430 is 17GB/s, and that of the competitor Qualcomm Snapdragon 805 is 25.6GB/s. At this time, the Exynos 5433 launched by Samsung is only 13.2GB/s, which is a bit unreasonable. Of course, the bandwidth reduction of the new generation product is not without precedent. On the iPad 4, we have seen the 17.6GB/s bandwidth brought by 128bit lpddr2 on the A6X, but the A7 on the iPad Air has shrunk to 12.8GB/s. The A7 greatly saves the bandwidth by relying on the three-level cache and frame cache compression technology, so that the iPad Air and iPad mini 2 still maintain excellent smoothness under the Retina screen. The T760 used on the Exynos 5433 also has the corresponding technology. The T760 has the AFBC frame buffer compression technology of ARM. With the new GPU architecture, it can significantly reduce the bandwidth occupation. Therefore, it is not impossible for the Exynos 5433 to use low-frequency memory, but we believe that it can maintain the level of the Exynos 5430 or even better. In addition, we can see from the table that the Mali-T760 frequency matched with Exynos 5433 reaches 700MHz, which is higher than the Mali-T628MP6 of Exynos 5430. There is no further information about the number of GPU cores.
Anandtech also said that according to the firmware and driver files of Exynos 5433, Exynos 5433 not only does not have the characteristics of a 64 bit SoC, but is even very similar to the 32-bit Exynos 5430, which uses the Cortex-A15/Cortex-A7 size core.
Anandtech judges that Exynos 5433 uses the combination of A57 and A53 LITTLE structure.
When using Android 4.4.4, Exynos 5433 still runs in the AArch32 mode. Anandtech also believes that naming this new SoC Exynos 5433 means that it is not a revolutionary design chip (it is really puzzling to say that even if the CPU core is changed...), and it will not run in the 64 bit mode in the future. Samsung's real power point will be the Exynos 7 series chips. Among them, Exynos 7420 will be Samsung's flagship SoC in the future, which will fully support 64 bit technology and AArch64 mode (on Android L). In addition, the Exynos 7420 will still be the product of the A57/A53, and the Mali-T760 will still be used, but the memory controller has been replaced with a more advanced LPDDR4.
Of course, the view that the memory bandwidth of Exynos 5433 is shrinking and 64 bits are castrated has not been clearly confirmed. In my opinion, we should wait for the eight core version of Galaxy Note 4 to be upgraded to Android L before we see the truth. At this stage, Galaxy Note 4, which uses Android 4.4.4, is already the performance leader of Android. We will also give a detailed introduction to its detailed evaluation after its official launch.
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