With the rapid development of mobile phone processors and performance, high-performance processors have become an important element pursued by many players. Many players will mention the "physique" problem of mobile phone processors. What does physique really mean, and how can we check the physique of mobile phones?

This article takes the high-end SoC commonly used in high-end mobile phones as an example, including Samsung's Exynos 7420, Qualcomm's Snapdragon 810 and MediaTek's MT6795.

What does the constitution of mobile SoC represent?

1. For the same model or even the same batch of mobile phones, there will be different constitutions, which is the same as the "big eagle" CPU often said in computer DIY. For mobile phones, the ex factory SoC constitution is also different.

2. What does a good "constitution" mean? The lower working voltage will obviously save more power. Of course, whether the difference here is large or not depends on the actual use environment.

3. Some mobile phones have a third-party overclocking core, which can overclock, reduce voltage and other operations on the processor. If we manually reduce the voltage, it can achieve the same effect as the high "fitness" SoC, but it is not guaranteed to work stably. In addition, if the SoC has good "physique", it can try to lower the working voltage to obtain better power saving effect.

4. As for the power consumption gap of different constitutions, when Anandtech conducted a detailed evaluation of the MX4 Pro, it found that in the GFXBench test, the power consumption of the Galaxy Alpha using the same SoC was 25% higher than that of the MX4 Pro processor. Later, they found that the Galaxy Alpha on their hands was the "penultimate" constitution (the original constitution was bin, link: ）The MX4 Pro is of "medium" physique, and their GPUs differ by 62.5mV under different frequencies when working (as shown in the figure below).

Next, let's take a look at the methods of checking the physique of high-end SoCs from Samsung, MediaTek and Qualcomm:

Samsung Exynos 7420 Exynos 5433

About the constitution of Samsung processor, Xiao Bian has published An article It was introduced that Samsung's high-end processor was still the Exynos 5433. In the era of the Exynos 7420, let's see what new progress has been made in this regard:

First, let's take a look at the corresponding voltage values of Exynos 5433 and Exynos 7420 under different frequencies of GPU and CPU under three typical constitutions ASV2, ASV9 and ASV15 (via Anandtech, for reference only).

In the earlier introduction, we checked the voltage and path corresponding to different frequencies of the GPU through the asv_table file (using the RE manager, you do not need to obtain root permission in the process), Exynos 5422 Open/sys/devices/11800000.mali/asv_table. For Exynos 5430, Exynos 5433, and Exynos 7420, open/sys/devices/14ac0000.mali/asv_table. For Exynos 5260, open/sys/devices/platform/mali.0/asv_table.

Here are some examples:

Korean Galaxy Note Edge (SM-N915K, Exynos 5433), 700MHz The working voltage is 1.075V , worse than ASV9 in the above table, belonging to Lower middle class The constitution of.

Hong Kong Galaxy S6 edge (SM-G9250, Exynos 7420), 700MHz The working voltage is 800mV , just in line with the table ASV9 , of Moderate constitution 。

Galaxy Note5 (SM-N9200, Exynos 7420), 700MHz The working voltage is 775mV ， ASV11 , of Upper middle physique 。

Next, a more intuitive and advanced viewing method is introduced. Although the RE Manager is also used, its threshold is much higher. You need to obtain Root permission and change the permissions of the read file:

After obtaining the system root permission (10000 words are omitted here), find /sys/kernel/debug/asc_summary , set the read permission, as shown in the figure.

Then it can be viewed in the text mode normally. After opening it, people suddenly feel that they have found a "new continent". Samsung simply, directly and violently marked the ASV value and refined it to CPU large core, small core, GPU and even ISP . The above figure is The Galaxy Note5 mentioned above can be seen G3D That is, the ASV value of the GPU is 11, which corresponds to 775mV at 700MHz.

Qualcomm Snapdragon 810

Although the Snapdragon 810 has many slots in terms of heat, power consumption and performance, many high-end models of mobile phone manufacturers still have to use it. After abandoning the PVS value, the Snapdragon 810 has a new and relatively complex way to view the physique.

One of the prerequisites for Snapdragon 810 to view physique is to obtain Root permission first. The tool used is still our old friend re manager. Open/sys/kernel/debug/cpr regulator/apc1 corner/debug info (where apc1 corner represents big core A57, and apc0 corner represents small core A53). After opening, as shown in the figure above, when running the Corner5, the voltage is 820mV (the test model is one plus two).

Then according to the source code, we can find the voltage value of the corresponding corner. For example, the best value of the corner 5 is 725mV, and the worst value is 900mV. So we can judge that the mobile phone we just tested is probably of medium deviation (photo source: ）。

To view the physique of other chips in the Snapdragon series, click some popular science articles before us:

one Snapdragon S4 Pro

two Snapdragon 600

three Snapdragon 800

four Snapdragon 801

MediaTek MT6795 MT6752

If not the Helio X20 (MT6797), which has not yet been launched in a large scale, then the Helio X10 (MT6795) is the most powerful processor of MediaTek. The mobile phones using this SoC can be said to include low-end mobile phones to high-end mobile phones. It also has its own way to check the physique:

Also use the re manager to open the /proc/cpufreq/cpufreq_ptpod_freq_volt , and this process does not require obtaining Root permission. After opening, you can see the voltage corresponding to the CPU frequencies of all levels. For example, here we use the MT6795M LeEco Superphone 1, the highest frequency 1950MHz , the voltage is 1.08125V . Here is also a reference for you, For the MT6795M, at 1950MHz, the 1.10xxV voltage is normal. Those above 1.11xxV can be considered as poor, while those below 1.09xxxV can be considered as good.

The above is a screenshot of Meilan Note using MT6752. You can see 1690MHz When the operating voltage is 987.5mV , which is also a common voltage of MT6752. In addition, we note that when the CPU 1170MHz（875mV） Compared with the above LeEco Superphone 1 1183MHz（900mV） , the voltage is lower, and this seems to be a common phenomenon, in other words, Compared with the MT6795M, the MT6752 has a lower voltage at the same frequency, which means it saves more power.

epilogue

After reading these SoC fitness check methods, do you think the whole person is bad? If you are a Virgo or a perfectionist, you may have more troubles after reading this article If conditions permit, individuals with relatively good physique can be selected before buying mobile phones. Of course, this environment is also limited to buying counterfeit mobile phones. It is also only applicable to Samsung SoC mobile phones (only GPU physical) and MediaTek mobile phones. For mobile phones and commercial mobile phones using Qualcomm SoC, you can only buy a mobile phone and then check your "RP". It should be noted that there will be no problem with the use of mobile phones with slightly poor physique, which may only be slightly worse in terms of endurance and fever. As the saying goes, it is not useless.