Knowledge of computer hardware and Computer Configuration

① What computer memory is used for.

Because memory is faster than hard disk, when the CPU starts working, it writes some of the commonly used information to memory and reads it from memory instead of from the hard disk when it is used. This reading speed is obviously faster to read the hard drive, improve the efficiency, so get a memory is necessary!

② often see for example DDR2 800 and DDR3 1333 what these represent

DDR2 refers to 2 generation of memory, memory is divided into DDR (1 generation), DDR2 (2 generation), DDR3 (3 generation), of course, performance comparison, 3 generation of performance >2 generation of >1 generation. As for similar to DDR2 800 here 800 refers to the memory bus frequency, the memory bus frequency determines the motherboard front-end bus frequency, such as DDR2 800 memory, the motherboard's front-end bus can only reach 800MHZ speed, DDR3 1333 for the memory bus frequency 1333MHZ.

What is the data bandwidth of the ③ memory?

In short, it refers to the speed of data transfer in memory. One formula is this, the data bandwidth of the memory = Bus frequency x bandwidth &pide;8. For example, DDR800 memory data Bandwidth =800 (MHZ) x64 (Bit) &pide;8=6.4 (GB/s). If you open a double channel, multiply by 2, which is 12.8gb/s. Currently using the memory is 2GB DDR3 1333, the price is only about 100 yuan, the following look at a very older DDR generation memory parameters.

Or use cpu-z software to view the detailed parameters of the memory (the following figure, Classic machine configuration):

The current mainstream memory brands are: Kingston, Granville just, delirium, Samsung, etc., the larger the memory capacity is better.