Category: Computer/Network gt; gt; Hardware

Problem description:

My computer was installed in 2003, the CPU is Celeron 2.0, and the memory It is 256M. It feels a bit difficult to use now. I want to add more memory modules to upgrade. Using CPUZ to detect the memory, the information displayed is: maximum bandwidth PC2100 (133MHZ); manufacturer is Samsung; particle number is M3 68L3223CTL-CB0. But from The information marked on the memory stick is: hynix 328A HY5DU56822BT-H KOREA KF02106. It is a modern memory. Is my memory fake? How to verify?

Thank you very much!!!

Analysis:

Most of the fake memory products are inferior products pretending to be brand-name products. Since qualified memory chip production first cuts the silicon wafer into small wafers, and conducts simple EDS testing to complete most of the functional testing of the chip, this is the pre-process; then the I/O (input/output) settings and Protection, this is the post-process; and finally, comprehensive testing of the entire chip is the inspection process. Since the inspection process takes the longest time, it is also more expensive. Some large manufacturers only do the pre-processing and then sell the primary products to other semiconductor manufacturers for post-processing. After completion, the semiconductor manufacturers do not conduct inspection processes or mark them before selling them to some memory module manufacturers. Some unscrupulous memory stick manufacturers purchase memory chips, manufacture memory sticks in handicraft workshops, and sell them under certain famous trademarks. The PCB board of the fake memory is of poor quality and rough in workmanship.

1. Fake memory may have the following characteristics

1. Whether the chip package is damaged.

2. The circuit board is rough in workmanship and has burrs and cracks.

3. Use the boot method to test for fake or bad SPD, and set "SDRAM Control By" to "BY SPD" in the BIOS.

4. Turn on the ECC verification of the memory in the BIOS, and turn on the computer to test the ECC parity to verify the authenticity of the memory.

5. Use potion to clean the chip and it will turn white and the writing will be rough.

6. The polished chip has scratches and the direction is consistent. The identification characters of real memory are usually darker.

2. Types of fake memory

1. Shoddy: JS shields some broken and available memory sticks, and some of the memory particles can still work normally, so After renovation, it was sold on the market.

2. Overclocking: Low-quality memory is usually passed off as high-quality memory. For example, the memory of PC100 is forced to work at 133MHZ. This is a hidden danger of instability in the whole machine.

3. Confusion: JS deceives consumers with the number of memory chip particles.

4. Polishing: Unlawful JS polishes some off-brand memory particles, erases the memory particle information on them, and then paints the logo of high-end brand-name memory particles for sale.

5. Reuse of foreign garbage: JS takes the foreign garbage sent from abroad into the memory, removes all the remaining good particles, and re-prints the PCB to assemble and produce new memory.

3. Distinguish memory A and B

Memory A and B refer to HY memory. Strip A refers to genuine products. There are two types of genuine HY products. One is the original HY strip. The chip and base plate are all original to HY. The other is the compatible strip of HY. The chip is HY but the base plate is not original to HY. Factory. The so-called B strips refer to polished strips. Polished strips are fake memory strips that are sold by marking non-HY chips with the HY brand. Some B strips are memory chips (white slats) that are not engraved with the brand name and are stamped with the HY brand with a laser, and some are some. An unknown small factory brands its own memory chips as HY, and then sells them as fake modern memory sticks.

To tell the authenticity of HY, you mainly need to look at the number in the lower right corner of the chip. The real HY number is engraved with yin and yang. Generally, it is not obvious and the font is relatively thin. You have to hold the chip diagonally towards the light to see it. Clear. The polished chip number is usually very clear, and the font is larger and very obvious. You can also use Tianna water to brush the chip. After brushing the real HY memory, the font will be displayed quickly. B bar usually takes a long time.

4. Real and fake Hynix memory chips

There is a circular groove in the lower left corner of the real Hynix memory chip, and there is also a row of slightly darker printing in the lower right corner. These characteristics of the fake chip None. In appearance, the genuine memory sticks have original labels, while the fake ones have ordinary stickers; the real Hynix memory chips are arranged without gaps on the entire circuit, while the fake ones have obvious gaps; the real Hynix memory chips A circular groove can be seen from the back, and the back of the fake Hynix memory chip has three circular marks arranged in a straight line.

5. Real and fake Jinbang gold bar memory

Real Jinbang gold bars are packaged in BLP and use a six-layer PCB board. The handwriting on the fakes is blurry, especially the gold characters. The circuit board is of poor quality, and the serial number and product name on the chip seem to have been polished. The characters are printed and lack the texture of laser etching. The writing on the SPD particle is also blurred, and the color of the circuit board is darker.

6. Authentic and fake KingMax memory

KingMax memory uses advanced TinyBGA packaging technology. From the surface, the chip pins should not be visible. Fake KingMax memory uses It is a traditional TSOP package, so you can clearly see the pins extending from the chip, and the TSOP packaged memory previously released by KingMax did not have the KingMax logo on the chip, so when purchasing, be sure to identify whether the memory chip adopts The package is TinyBGA.