Found that the memory can not be read and written and the solution

I believe that everyone who uses the Windows operating system has encountered this experience: the following error message appears when running a program: "0X???? The ???? instruction references 0x00000000 memory, the memory cannot be read or written”, then the application is closed.
Many computer users are confused when they encounter this situation. I don't know what to do. In fact, the generation of such an error message is a big problem to explain the memory problem. What is memory? In the composition of the computer, there is a very important part, that is, storage components. Memory refers to the storage components on the motherboard, which are important components that the CPU directly communicates with and store the data and commands that are currently in use (ie, in execution). When you type a command with a keyboard or mouse, the CPU interprets the command and loads the command or program into memory so that the program can be executed. Once the memory has a problem, the program can't be executed, so it comes up with the above mentioned "this memory can't be read or written" error.
After knowing the importance of memory, we must pay special attention when choosing memory. Many people have a headache for the purchase of memory. Indeed, due to the uneven quality of the memory modules on the market, counterfeit and shoddy products are flooding the market. When purchasing, it will take some time. Inferior memory on the market is nothing more than two forms, one is inferior products, the other is Remark (that is, polished) memory, which is to remark the high-clock cycle memory chip into a low-clock cycle product, and then Sell ​​at a high price with a low clock cycle product and earn the difference. The words on the polished memory chip are not clear, and there is no depth. If you look carefully, you will find that it is printed. The words on the memory chip that have not passed Remark should be recessed. These words are laser engraved. When you touch it, you can feel different from Remrk's products. Therefore, you only need to pay attention when purchasing. Will not be fooled. It is not so easy to identify bad memory. Inferior memory modules work very unstable, and work at rated frequencies will appear "this memory can not be read or written" phenomenon, most of the PCB boards of this type of memory do not use the six-layer board specified by PC100 but four layers and rough workmanship The edge of the board is not cut well, and some have thorns. If you find such a memory, it must be a product of very poor quality. If it is not good, it is produced in a hand workshop. The production cost of these inferior memory is much lower than that of the regular channel, so the price of this type of memory is usually tens of dollars lower than the real memory. You don't want to buy the inferior memory in order to save the money. When you stop the crash, you will lose a little.
Also choose which size of memory, depending on the motherboard and CPU. The most common memory models on the market today are DDR266, DDR333 and DDR400, which correspond to PC2100, PC2700 and PC3200 respectively. For the Athlon XP, the front-side bus frequency of the 2400+ and below models is 266MHz, so the single-channel DDR266 can meet the CPU requirements. The front-side bus frequency of the Athlon XP 2500+~3000+ is 333MHz, so it needs to be matched with DDR333 memory. For the same reason, the Athlon XP 3200+ with a front-side bus frequency of 400MHz needs to be matched with DDR400 memory to meet the demand. Due to the low cost performance of high-end products, the current AMD platform to purchase DDR333 is enough to meet the demand. When the memory frequency exceeds the CPU front-end bus frequency, the clock will be out of sync, but a small performance degradation will occur. For P4, the opposite is true. Since the front side bus frequency of P4 is 400MHz/533MHz/800MHz, the memory bandwidth is also very large. However, when it comes to the previous chipset of the i845PE, the official only supports DDR266, but the motherboard manufacturers provide DDR333 support. The i845PE officially provides support for DDR333. The i865PE provides support for 800FSB P4. When paired with the 800FB P4, the default frequency of the memory is 200 (400) MHz, and the old P4 is the same as the i845PE. Therefore, the best partner of the current 800FSB P4 is DDR400 memory, plus the dual channel of the i865, the performance of the 800FSB P4 can be fully utilized. Considering the overclocking of Celeron, DDR333's memory is a good match for the 400/533FSB CPU.