it plays an important role in the computer. Memory generally uses semiconductor storage units, including random access memory (RAM), read-only memory (ROM) and CACHE. Just because RAM is the most important memory. The memory usually refers to the RAM in the computer system. RAM is somewhat like the blackboard in the classroom. The teacher keeps writing on the blackboard during class and erases it after class. RAM requires constant power supply at all times, otherwise data will be lost. It would be nice if the data in RAM is not lost after the power is turned off, so that the computer can be guaranteed to be in the last shutdown state every time it is turned on, instead of restarting the computer and reopening the application program every time. But RAM requires constant power supply. Is there any way to solve this problem? With the development of technology, people have thought of a way to supply a small amount of power to RAM to keep the data of RAM from being lost. This is the hibernation function of computers, especially in Win2, when the power supply is connected, it consumes a small amount of electricity. According to the interface form of memory stick, there are two kinds of common memory sticks: single in-line memory stick (SIMM) and dual in-line memory stick (DIMM). SIMM memory chips are divided into 3 lines and 72 lines. Compared with SIMM memory stick, DIMM memory stick has 168 pins. DIMMs can be used singly, different capacities can be mixed, and SIMM must be used in pairs. According to the working mode of memory, memory has FPA EDO DRAM and SDRAM (Synchronous Dynamic RAM) and other forms. FPA(FAST PAGE MODE)RAM Fast Page Mode Random Access Memory: This is the memory commonly used in earlier computer systems, which transmits data every three clock cycles. EDO(EXTENDED DATA OUT)RAM extended data output random access memory: EDO memory cancels the time interval between two storage cycles of the motherboard and the memory, and it outputs data every two clock cycles, which greatly shortens the access time and improves the storage speed by 3%. EDO is generally 72 pins, and the memory of EDO has been replaced by SDRAM. S (Synecronous) DRAM synchronous dynamic random access memory: SDRAM has 168 pins, which is the memory used by PENTIUM and above models at present. SDRAM locks CPU and RAM together through the same clock, so that CPU and RAM can share a clock cycle and work synchronously at the same speed, and the rising edge of each clock pulse begins to transfer data, which is 5% faster than that of EDO memory. DDR (Double Data Rage) RAM: an updated product of SDRAM, which allows data to be transmitted at the rising and falling edges of clock pulses, so that the speed of SDRAM can be doubled without increasing the clock frequency. The price of computer configuration is as follows: CPU: E216 (dual-core) motherboard: ASUS 945PL memory module: 1GB hard disk: 25G serial graphics card: 7 Rainbow 84 optical drive: DVD-RW power supply: Great Wall 3W power supply chassis: P5 professional chassis special price: 238CPU: E46 (dual-core). Motherboard: ASUS PSK-SE memory module: 2GB hard disk: 25G serial graphics card: 7 Rainbow 86 optical drive: DVD-RW power supply: Great Wall 35W power supply chassis: P5 professional chassis special price: 368CPU:52 48 motherboard: MISP43-F 599 memory: 2G1 graphics card: Onda 96. GT 5 hard disk: 32G 32 power supply: 35W 28 mouse and keyboard: 6 This configuration is absolutely not stuck in playing games, and 52CPU is super. The CPU speed that can catch up with 8 exceeds the post-AMD Athlon64 X2 775 (black box) 445 motherboard: MSI KA78GM2 499 (the good 79 board is too expensive and the low-end one is very poor. Anyway, it's only 499 yuan to buy MSI 78 from the first-line factory.) Graphics card Sapphire HD467 Gold Edition 499 hard disk Seagate 32 32 CD-ROM drive 16X chassis is 38 degrees. Power supply Hangjia Cold Diamond King 2.31 (no problem for platforms below quad-core) keyboard and mouse Shuangfeiyan 65 display LG1942SP 8595GT is too low-end, no! Change it to 96GSO, if you are comfortable, 98 or 98GTX. Now 98 is only 799 and 98GTX is only 999 yuan. If 98 and 98GTX are too expensive, 96GT is also a good choice. The performance is between 96GSO and 98, and the price is 6-7 yuan. Jabbo is a 2-and 3-line manufacturer. If the price is over 3, yuan, the P43 can use the motherboard of ASUS or Gigabyte. By the way, P43 is INTEL's motherboard, and AMD processors can't be installed, so it is suggested that the CPU be replaced by E73 or E74 or 8 series INTEL CPU. If you insist on AMD's 775, then switch to 78G board, which has good performance. The power supply must be rated at 35W. Memory is now the price of cabbage, then come to 4G, and the price is also 3 yuan. If you don't understand anything, just ask me. Give it to me. Thank you. ` `