The core circuit board, the brain of navigation, is the most critical component of the whole navigation, and its quality directly affects the response speed of various applications. Next, Xu Xin will take you to read the brain of navigation.
The core circuit board of navigation generally consists of the following three main components: CPU, DDR and FLASH, as shown in the following figure:
These three components directly determine the operation and response speed of the whole navigation. Among them, CPU is the computing center of the brain, and the speed of CPU is generally measured by two parameters: the number of cores and the working frequency; DDR is generally called cache, which is related to the draft paper when we solve math problems in school. It is used to store temporary data, which is equivalent to the memory of a computer. FLASH is used to permanently save data, which is equivalent to the hard disk of a computer.
Let's see how the CPU is faked.
The use environment of vehicle-mounted appliances is much worse than that of household appliances. In order to ensure the stable and reliable operation of car navigation, CPU manufacturers will make many optimizations on the CPU used for car navigation, such as MTK8227 series. ; The CPU for tablet computers does not need these optimizations. For example, Quan Zhi Series A is a CPU specially designed for tablet computers.
Some unscrupulous manufacturers use CPU originally used for tablet computers instead of car navigation to reduce costs, so the stability of car navigation can not be guaranteed.
The working frequency of CPU is generally not very concerned by everyone, and few people will mention it. If there is no fraud, I won't say much.
The hardest hit area of CPU fraud is the number of parameters: the number of cores, which is emphasized here.
At present, the CPU commonly used in car navigation is generally dual-core and quad-core, and there is no eight nuclear chip used in mature products. The most common cheating method here is to change the number of cores in the system information of dual-core navigation from "X2" to "X4", and then call it a quad-core product to cheat customers, and some people call it eight nuclear.
In fact, it is easy to identify, just take the machine apart and query the model of CPU. Commonly used dual-core CPU on lathe are: MTK82 17, MST786, Orvina T2, etc. The commonly used quad-core CPUs of lathes are: MTK8227, ALLWINER T3, PX3, SoFIA, etc.
Some people will say that I can't understand it even if I open it, or it's not the model I listed above at all. It doesn't matter, as long as one action, you can see it immediately: write down the model and ask Du Niang, and the omnipotent Du Niang will definitely tell you what the truth is!
Tomorrow, Xu Xin will show you that it has the greatest impact on the running speed, and it is the easiest to blind everyone's understanding of DDR running memory capacity by modifying parameters.
The third season is DDR, so stay tuned.