显卡必读（Graphics must read）.doc

显卡必读（Graphics must read） We go to the store to buy video cards, often heard such a dialogue: The first version: this video card is good, 128 bit (bit) graphics card, the performance is much better than the 64 bit. Second versions: the memory card is 256, only the top card is the specification, now Im just a cheap dumped goods. The memory interface has become an important means of business promotion card, and is widely used, then the memory interface is really as they say so important? How should we choose? What is the memory interface? Is the memory interface to transmit data to memory bits in one clock cycle, the greater the amount of data bits of a clock cycle can transmit more (bit Chinese become position, the 8 bit is a byte memory interface) is one of the important parameters of memory. Currently on the market of the graphics memory interface are mainly 64bit, 128bit, 256bit three specifications, which are also part of manufacturers for the entry-level market launch of the 32bit GeForce 6200 graphics card, and the latest ATI Radeon HD 2900XT top graphics using 512bit graphics, reached the top level of the memory interface. We often hear people say 128 bit graphics and 256 graphics refers to the size of the memory card interface. The greater the amount of data memory interface, a single clock cycle can transmit more, so in the case of the same clock frequency, 256bit card provides the amount of data transmission is one times higher than the 128bit card can, that is we often say that the memory bandwidth. What is the memory interface, we look at why the memory interface is of great importance to us? Memory interface and why is it so important? About graphics memory interface due to the size of each clock cycle to the amount of data transmission, so for the moment would require a large number of data transmission card game is the most important. First, lets look at a formula: Memory bandwidth = memory interface * memory frequency /8 From this formula we can see th