Video card: video memory bit width

The bit width of video memory is the number of bits of data that can be transmitted by video memory within a clock cycle. The larger the number of bits, the larger the amount of data that can be transmitted instantly. This is one of the important parameters of video memory. At present, there are three kinds of video memory bit widths in the market: 64 bit, 128 bit and 256 bit. The 64 bit video card, 128 bit video card and 256 bit video card are the corresponding video memory bit widths. The higher the bit width of video memory, the better the performance and the higher the price. Therefore, 256 bit wide video memory is more used in high-end video cards, while 128 bit video memory is basically used in mainstream video cards.

As we all know, video memory bandwidth=video memory frequency X video memory bit width/8. If the video memory frequency is the same, the video memory bit width will determine the video memory bandwidth. For example, for 128 bit and 256 bit video memory with the same video memory frequency of 500MHz, their video memory bandwidth will be 128 bits=500MHz * 128 ／ 8=8GB/s, while 256 bits=500MHz * 256 ／ 8=16GB/s, which is twice the 128 bits. It can be seen that the video memory bit width is important in video memory data.

The video memory of the video card is composed of blocks of video memory chips, and the total bit width of video memory is also composed of the bit width of video memory particles,. Video memory bit width=video memory particle bit width × number of video memory particles. The video memory particles are all provided with the memory number of the relevant manufacturer. You can search the number on the Internet to find out its bit width, and then multiply it by the number of video memory particles to get the bit width of the video card. This is the most accurate method, but it is troublesome to implement.