How do I Upgrade Notebook RAM?

Notebook memory can be roughly divided into three types: EDO, SDRAM, and DDR. Several well-known memory manufacturers and codes: Hynix: HY, Samsung (SAMSUNG): KM or M, NBM: AAA, Siemens (SIEMENS): HYB, Goldstar LG-SEMICON: GM, Mitsubishi (MITSUBISHI): M5M , Fujitsu (FUJITSU): MB, Motorola (MOTOROLA): MCM, MATSUHITA: MN, OKI: MSM, Micron (MICRON): MT, Texas Instruments (TMS): TI, Toshiba (TOSHIBA): TD or TC, Hitachi (HITACHI): HM, STI: TM, NEC: UPD, IBM: BM, NPNX: NN.

Notebook memory

Notebook memory can be roughly divided into three types: EDO, SDRAM, and DDR. Several well-known memory manufacturers and codes: Hynix: HY, Samsung (SAMSUNG): KM or M, NBM: AAA, Siemens (SIEMENS): HYB,

Due to the high integration and precise design of notebook computers, the requirements for memory are relatively high. Notebook memory must meet the characteristics of compactness. It requires high-quality components and advanced technology. It has a small size, large capacity, fast speed, low power consumption, and heat dissipation. Good features. For the sake of small size, most laptops only have a maximum of two

EDO memory: This memory is mainly used on ancient MMX and 486 models. Some manufacturers still use EDO memory in PII notebook computers. The maximum capacity of this EDO single bar is only 64M, and the operating voltage of EDO memory is 5V Compared with the commonly used 3.3V of SDRAM, it consumes more power, so it is soon replaced by SDRAM memory.

SDRAM memory: The notebook has gone through the Pentium era, and the speed of the CPU has become faster and faster. At this time, Intel proposed a landmark memory technology-SDRAM. The full name of SDRAM is Synchronous Dynamic Random Access Memory. As its name indicates, this RAM can keep all input and output signals in sync with the system clock. Because the bandwidth of SDRAM is 64Bit, it only needs one memory to work, and the data transfer speed is at least 25% faster than EDO memory. SDRAM includes PC66, PC100, PC133 and other specifications.

DDR memory: as the name implies: Double Data Rate (Double Data Transfer) SDRAM. With the introduction of desktop DDR memory, notebook computers have also entered the DDR era. There are specifications such as DDR667 and DDR800. In the mainstream, Pentium4-M, Pentium-M, and P4 core Celeron machines all use DDR memory. A small number of Pentium3-M machines entered the DDR era early. In fact, the principle of DDR is not complicated. It allows the original SDRAM that reads data once in one pulse to read data twice in one pulse, that is, both the rising edge and falling edge channels of the pulse are used. Therefore, DDR is also essentially It's SDRAM. And compared to EDO and SDRAM, DDR memory is more power-saving (the operating voltage is only 2.25V), and the single-bit capacity is larger (already can reach 4GB). ^[1]

DDR2 and DDR3: Everyone knows that SDRAM memory can only transmit 1 bit of data at a time. DDR, DDR2, and DDR3 developed on SDRAM memory can transmit 2 bit, 4 bit, and 8 bit data at a time. The working frequency of DDR 2 ranges from 667MHZ to 1066MHZ, and the working voltage is 1.8V. The working frequency of DDR3 is from 1066MHz to 1666MHZ, and the working voltage is 1.5V. Therefore, from DDR2 to DDR3, the performance is better and the power consumption is lower. ^[2]