What is the use of memory bandwidth What is the difference between the bandwidth of video memory and

The bit width of the video memory is the number of bits of data that can be transmitted by the memory in a clock cycle, and the larger the number of bits, the greater the amount of data that can be transmitted in an instant, which is one of the important parameters of the video memory. At present, there are three kinds of memory widths on the market: 64-bit, 128-bit and 256-bit, and people are accustomed to calling 64-bit graphics cards, 128-bit graphics cards and 256-bit graphics cards to refer to their corresponding memory bit widths. The higher the memory bit width, the better the performance**, so the 256-bit wide video memory is more used in high-end graphics cards, while mainstream graphics cards basically use 128-bit video memory.

As you know, the memory bandwidth is 8, so in the case of the same memory frequency, the memory bit width will determine the size of the memory bandwidth. For example, if the same memory frequency is 500MHz for 128-bit and 256-bit video memory, then their memory bandwidth will be: 128-bit 500MHz*128 8=8GB s, and 256-bit 500MHz*256 8=16GB S, which is twice that of 128-bit, which shows the importance of memory bit width in video memory data.

The video memory of the graphics card is composed of video memory chips, and the total bit width of the video memory is also composed of the bit width of the video memory particles. Memory bit width Memory particle bit width Number of memory particles. The memory particles are equipped with the memory number of the relevant manufacturer, you can go to the Internet to find its number, you can understand its bit width, and then multiply it by the number of memory particles to get the bit width of the graphics card.

This is the most accurate method, but it is more troublesome to implement, and the following is a simpler one, but it is only suitable for general situations, and there are some special circumstances, which can be applied in most cases. At present, there are two main packaging forms of video memory: TSOP and BGA, under normal circumstances, the video memory of BGA package is 32 bits, and the particles of TSOP package are 16 bits? pcs.

If the graphics card uses four BGA package memory, then its bit width is 128 bits, and if it is eight TSOP package particles, then the bit width is also 128 bits, but if the graphics card only uses four TSOP package particles, then the memory bit width is only 64 bits. This is just a general skill, not necessarily all situations, to make the most accurate judgment, or look at the memory number!

Video memory is to a graphics card what memory is to a whole computer, it is responsible for storing all kinds of data that the graphics chip needs to process. The size of the memory capacity and the level of performance directly affect the display effect of the computer.

Affects the speed at which data is exchanged between the video memory and the display core.

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Analysis: Video memory capacity is the amount of video memory on the graphics card, which is one of the key parameters for choosing a graphics card. The amount of video memory determines how much data is stored temporarily.

There are several graphics card memory capacities such as 16MB, 32 MB, 64 MB, 128 MB, etc., and graphics cards with 16 MB and 32 MB video memory are now relatively rare, and the mainstream ones are 64 MB and 128 MB products. There are also some products that use 256 MB of video memory capacity, but it should be emphasized that 256 MB of video memory does not bring performance improvement in current home applications, which is a little wasteful.

Memory bandwidth refers to the data transfer rate between the display chip and the video memory, which is measured in byte seconds. Memory bandwidth is one of the most important factors in determining the performance and speed of a graphics card. In order to obtain detailed (high resolution), realistic colors (32-bit true color), and smooth (high refresh speed) 3D images, it is necessary to require the graphics card to have a large memory bandwidth.

At present, the performance of the display chip has reached a very high level, its processing power is very strong, and only a large memory bandwidth can ensure its sufficient data input and output. With the increasing hardware requirements of multi-** and 3D games, in the face of high-resolution, 32-bit true color and high refresh rate 3D pictures, compared with GPU, low memory bandwidth has become a bottleneck restricting the performance of graphics cards. Memory bandwidth is one of the most important factors in determining the graphics performance and speed of a graphics card.

The formula for calculating the memory bandwidth is: memory bandwidth, operating frequency, memory bit width 8. At present, most low-end graphics cards can provide video memory bandwidth, while high-end graphics card products provide more than 20GB of video memory bandwidth.

When conditions allow, it is a key to choose to buy a graphics card with a large memory bandwidth as much as possible.