Fake memory mostly uses inferior goods as brand-name products. Because of the qualified production of memory chips, first, the silicon wafer is cut into small wafers, and a simple EDS test is carried out to complete most of the functional tests of the chip, which is the pre-process; Then I/O (input/output) setting and protection are performed on the wafer, which is post-processing; Finally, the whole chip is tested comprehensively, which is the inspection process. Because the inspection process takes the longest time and costs more. Some big manufacturers only sell their primary products to other semiconductor manufacturers for pre-treatment and post-treatment. After the completion, the semiconductor manufacturer sold it to some memory chip manufacturers without inspection or any identification. Some illegal memory stick manufacturers buy memory sticks and make them in manual workshops, and sell them under some famous trademarks. The PCB of fake memory is of poor quality and rough workmanship.

A false memory may have the following characteristics

1. Whether the chip package is damaged.

2. The circuit board is rough with burrs and cracks.

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

4. Open the ECC check of the memory in the BIOS and start the ECC parity sample to verify the authenticity of the memory.

5. Washing the chip with medicine will turn white and the handwriting will be rough.

6. Polished chips are scratched in the same direction, and the existing identification characters are generally dark.

Second, the types of false memories

1. shoddy: JS shielded some broken and usable memory chips, and some memory particles can still work normally, so it was reformed and sold in the market.

2. Overclocking: Usually, low-quality memory is passed off as high-quality memory, for example, the memory of PC 100 is forced to work at 133MHZ, which is a hidden danger of instability of the whole machine.

3. Confuse the audience: JS deceives consumers with the number of particles in the memory chip.

4. Polishing: Illegal JS polishes some memory particles of miscellaneous brands, erases the memory particle information on them, and sells them under the logo of high-end brand-name memory particles.

5. Reuse of foreign garbage waste: JS takes all the good particles left in the foreign garbage memory, re-prints the PCB and assembles it to produce a new memory.

Third, distinguish between memory a and memory B.

A and B of memory refer to HY's memory. Article A indicates that there are two kinds of genuine HY, one is original HY, the chip and backplane are original HY, and the other is compatible HY, the chip is HY, and the backplane is not original HY. The so-called strip B refers to the polishing strip. Polishing bars are fake memory chips, which are sold under the brand of non-HY chips. In Part B, some memory chips (white boards) are marked with HY by laser, and some unknown small factories mark their own memory chips with HY, and then make fake modern memory chips to sell.

Distinguishing the authenticity of HY mainly depends on the serial number in the lower right corner of the chip. The real HY serial number is engraved in Yin and Yang. Generally, it is not obvious, and the font is thin. Only by tilting the chip to the light can you see it clearly. After polishing, the serial number of the chip is generally clear and the font is large and obvious. You can also brush the chip with Tianna water. After the memory of real HY is brushed, the font will be displayed quickly, which usually takes a long time.

Fourth, true and false Hynix memory chips

True Hynix memory chip has a circular groove in the lower left corner and a row of slightly darker words in the lower right corner. None of these features can be found in fake chips. From the appearance, the real memory stick is the original label, and the fake one is the ordinary sticker; The real Hynix memory chips are arranged in the whole circuit without gaps, while the fake ones have obvious gaps. The real Hynix memory stick can see the circular groove from the back, while the fake Hynix memory stick has three circular marks arranged in a straight line on the back.

Verb (abbreviation of verb) True and False Gold Bar Memory

BLP is packaged as real gold bars with six layers of PCB. False handwriting is blurred, especially golden lettering. The quality of the circuit board is poor, and the serial number and product name on the chip seem to have polished marks. The text is printed and lacks the texture of laser etching. SPD particles are also difficult to identify, and the color of the circuit board is dark.

Six, true and false KingMax memory

KingMax memory adopts advanced TinyBGA packaging technology, so the chip pins should not be visible on the surface. The KingMax memory in Shanzhai is packaged in traditional TSOP, and the pins extending from the chip are clearly visible. Moreover, before the TSOP packaged memory produced by KingMax, there was no logo marked with KingMax on the chip, so it was necessary to identify whether the memory chip was packaged with TinyBGA when purchasing.