Landlord, please think twice! ! ! ! ! ! !
1. When buying hardware products from packaging anti-counterfeiting labels
, the first thing is to look at the product packaging. Taking Kingston memory as an example, starting from January 1th, 25, all Kingston products distributed in China will adopt brand-new "nano-refraction" anti-counterfeiting labels. It is said that this anti-counterfeiting label similar to laser technology is absolutely impossible to be faked, and this anti-counterfeiting label will replace the one that has been used for two years. For other products, such as motherboards, graphics cards, CD-ROMs, etc., due to the use of outer packaging, there are generally 8 and other free consultation telephones on the boxes, through which you can consult whether the products of manufacturers are genuine. For example, SONY's magneto-optical storage products (CDRW, DVDRW, etc.) sold in China are all licensed with the blue anti-counterfeiting label of China Quality Inspection Association. The label consists of two layers of stickers. The anti-counterfeiting code can be seen on the second layer of stickers when the surface layer of the label is uncovered, but there is no anti-counterfeiting code on the labels of parallel imports and fakes. After purchasing, you should immediately uncover the surface layer and call the toll-free number on the anti-counterfeiting label 881646 to check the authenticity of the purchased products. In addition, SONY's licensed products are affixed with the anti-counterfeiting label of "Sony original Lifu agent". This is an important way to identify licensed goods, parallel imports and fakes (special reminder: counterfeit parallel imports are also labeled with anti-counterfeiting trademarks).
2. Look at the authenticity from the chip itself
Because many JS packages the products too truly, and many users buy bulk products (such as bulk CPU, memory and hard disk), users can't identify themselves through the external packaging, so we should identify them from the quality and technology of the hardware itself. For hardware such as CPU, memory, etc., because its core chip is exposed, it is often the easiest product for JS to polish or fake. We can easily use eye recognition. Take AMD XP25+ as an example. In fact, the counterfeit XP 25+ is polished from the 2+ of Thorton's core, and its core is the same as Barton 25+,except that the secondary cache is closed by half, which is 256KB. The original counterfeiting method is to connect the L2 golden bridge on the CPU surface with a pencil or silver paint, and then open another 256KB cache. Thus, a Thorton core XP2+ with a price of only 4 yuan has been transformed into an XP Barton25+ with a value of more than 7 yuan, and JS has made huge profits in 2 yuan. In addition, because the fake XP 25+ has tampered with the L2 Golden Bridge, JS usually covers this key place with a fragile label.
Take hynix's modern memory as an example. Now, almost nine times out of ten hynix's modern memory is polished fake stripes. We compare a genuine piece with a polished hynix memory. On the surface, it seems that there is not much difference. But as long as you look carefully, there is a unique circular pit on the corner of the memory particle. Without polished particles, the pits are shiny, and the surface of the particles feels like sand grinding. However, the polished memory is coated with a layer of black paint, so the pits are almost filled up, and the laser etching on them will fall off when you scrape it with your fingers. The polishing method of these memories is relatively simple, and it is easy for your eyes to see them after covering the coating.
3. Looking at the quality from PCB layout
For graphics cards, motherboards and other products, because the core is covered by the heat sink, it is impossible to disassemble the heat sink when purchasing. In addition to identifying from the above methods, it is also an important means to identify the quality of its own PCB layout. For example, a graphics card with the same specification, model and chip is designed with a public PCB, while some fakes use a non-public PCB design because of cost control. "Non-public board" is more often just a product born for "low cost" or publicity needs. For example, because many people's understanding of PCB would like to stay at the level of "so-and-so graphics card uses N-layer PCB" and "the more layers of PCB, the better", JS has an opportunity ... While a graphics card obviously only uses 4 layers of PCB, JS must say that this graphics card uses 6 layers of PCB.
to identify the quality of PCB, we have to start from the details. For example, by observing the oxidation around blind holes and solder, everyone can know whether the PCB is made of good or bad materials; By observing the transparency of the PCB edge, you can know the approximate thickness of the PCB. Of course, if the merchant can provide a number of different graphics cards in kind, then the identification work will be easier to carry out! For example, the low-pass filter circuit that can't be ignored, the low-pass filter circuit (generally, the low-pass filter circuit is close to the VGA output interface of the graphics card, which is composed of many capacitors and inductors to improve the stability of the display signal and finally obtain high-quality output pictures), few consumers pay attention to it, but many graphics card manufacturers squeeze profits from him. In addition, some fake motherboard products only use 2-phase power supply design, while genuine high-end products use 3-phase or even 4-phase power supply design. Or some inferior products use inferior capacitors and other components, which not only makes the motherboard unable to overclock, but also crashes frequently under normal work. There are also some fake products, although the specifications are the same, but some functions are omitted, such as originally supporting 3 memory slots, but only 2. Adopt low BIOS version and low-grade integrated sound card, and even omit some additional functions such as network card and 1394 (if genuine).
second, hand-balancing method: it is also very important to feel in your hands
for products such as graphics cards, motherboards and power supplies, you can also feel with your own hands, that is to say, you can know what is going on by weighing the products. For example, the motherboard or graphics card, the genuine product adopts large board design, and the specifications are very high. For friends who can't identify the component itself, it is impossible to identify the fake product from the appearance, because the fake product is also a large board design, but as long as you compare it, take the fake motherboard in your hand, its weight is very light, while the genuine product is very heavy.
this is because the genuine products use good PCB and components with good quality, while the fake products use thinner PCB, and the components on the motherboard are also inferior, even saving some unimportant components, so it is of course much lighter. Generally speaking, the PCB of a good board has smooth edges and corners (it doesn't hurt hands), and the hands feel very comfortable. Holding the board in your hand feels heavy and very textured.
Another example is the power supply. At present, the thickness of the steel plate of the power supply housing is generally .6MM or .8 mm.. Power supply should have a heavy feeling in your hand, especially for some power supplies that have passed safety regulations or certification, some circuit boards and parts will be added to increase their safety and stability, and the weight will of course increase. Moreover, according to the current production method, the larger the power, the thicker and denser the coils and other components inside, so the heavier the weight should be. Although it cannot be arbitrarily said that the heavier the power supply, the better, but the light weight is definitely not good.
Third, the tool method: testing the real quality with software
Although the above methods can greatly prevent the purchase of counterfeit goods, these are all theoretical "on paper". If you want to know whether the products you bought are real or whether their performance is as good as what the merchants say, it will be clear at a glance to test them with some professional tools and software (the following hardware products in software testing are for your reference only).
1. Testing the performance of CPU
In the whole PC system accessories, CPU undoubtedly plays the most important role. Many friends don't know enough about CPU, mistakenly think that the higher the main frequency of CPU is, the better the price is, and the higher the performance is, especially for some polished and fake CPU. When an expensive "core" is bought back to home, it is either because of playing games, or the speed of rendering animation is not satisfactory. Let's take a look.
if it is an INTEL processor, you can use the Processor Frequency ID Utility, a tool developed by INTEL for yourself. It uses a frequency determination algorithm to check the internal data in the processor, compares this data with the detected operating frequency, and finally informs the user of the overall system status as a comparison result. Run the Processor Frequency ID Utility and its main interface will appear. From here, we can see that the CPU is INTEL Celeron IV 1.7G, and the system bus frequency is 4Mhz；. While "CPUID data" shows detailed parameters of CPU, such as processor characteristics, cache information, etc.
if it is AMD's CPU, it can be detected by AMD CPUID software, which can measure the CPU speed produced by AMD, as well as some ids and data of the CPU. Of course, you can also use WCPUID universal test software, which supports both INTEL and AMD processors. Besides the general ID information of CPU, internal/external frequency, frequency doubling number and other basic information, it can also detect whether CPU supports MMX, KNI and 3Dnow! Instruction.
Sisoft Sandra can carry out systematic theoretical tests on CPU, including professional tests on CPU Arithmetic and CPU Multi-Media, so that we can know the performance of floating-point unit of CPU. Run Sisoft Sandra software, find two projects, CPU Arithmetic Benchmark and CPU Multi-Media Benchmark, in the main interface of the program, and run the tests separately.
Super π is a small software for Japanese overclocking experts to measure their achievements. It uses the floating-point operation ability of CPU to calculate π (pi), which overclocking players generally use to test the stability of the system and the time required for testing the pi of a specific digit after CPU calculation. After opening the software, click "Start Calculation", and then select the 1,-bit π value you need to test in the drop-down menu to calculate the time required for CPU testing. The shorter the time, the higher the CPU performance. We can find the results of the corresponding model CPU in some evaluation articles. For some inferior CPUs, either the results are obviously different, or they will "crash" after running for a long time.
2. Test the performance of memory
For ordinary users, they have no ability to identify counterfeit and inferior products in memory, and these memories often lead to the phenomenon that the machine is interrupted during the game and the picture is paused and slow. Therefore, how to test your memory performance and master the memory performance is helpful for us to understand the memory requirements of the game, thus making you invincible in the game competition.
take Samsung DDDR333 memory as an example, run SiSoft Sandra, select the "Mainboard Information" option in the main interface and run it, and you can get the memory-related information. From this, we know that this is a 256MB PC27(DDR333) memory. When the memory works at the external frequency of 133MHz, the default CAS delay time (CL) is 2; When the CL value is 2.5, the standard working frequency of the memory is 167MHz, which is a little higher than the standard 166MHz. If we want to test the stability of the memory when it works, we need to run CPU Benchmark calculation for more than 1 times with the Burn in test item in SISoft Sandra as the standard of memory stability, and all of them are determined to be stable.
3. Test the monitor
For the monitor, if you buy a brand product, there is basically no big problem. If you are not at ease, you can display the information of the monitor under the "Monitor" of the "Monitor" of AIDA32 software. If you buy enough LCD monitors, affected by the production process, LCD monitors sometimes have bright spots, dark spots or even bad spots. So how can we know if there is a bad spot on the LCD screen? You can make a judgment with DisplayX software. After running the software, you can switch the colors of white, red, green, blue and black from time to time in the state of full screen by selecting the routine single test-solid color. As long as you find that the screen has a fixed point with a constant color, it is a bad point. However, due to the manufacturer's regulations, products with less than 3 bad spots are generally normal products, so this is not to say that there is a problem with product quality. However, if some merchants guarantee that there are no bad points, using this to test can let the merchants change you to a product that really has no bad points.
in fact, in addition to the above methods, you can also get more hardware information in the motherboard BIOS and boot screen. Of course, when buying in reality, we need to constantly learn from our experience. For example, we should choose some large-scale businesses to buy, and don't just go to some unknown small stalls and "grocery stores". Secondly, when purchasing, the other party must issue a formal invoice for the product warranty, and write down the product warranty clearly so that we can make complaints in the future. In fact, there are many ways to prevent the purchase of fake goods. The above only provides some reference ideas, and does not represent all methods and means.