Bit width is the amount of data that memory or video memory can transmit at one time.Simply speaking, it is the data width that can be transmitted at one time, just like the lane width of the highway, two-way four lane, two-way six lane. Of course, the more lanes, the larger the number of cars that can pass at one time. So the larger the bit width, the more data that can be transmitted at one time. For the video card, the performance is significantly improved.
So calledMemory bandwidth, which means memoryBusThe data transmission capability that can be provided, but it depends onMemory chipandMemory moduleRather than pure bus design, plus its importance, it is often discussed as a separate object.
Memory interfaceIs stored in aClock cycleData that can be transmitted withindigitThe larger the number of bits, the greater the amount of data that can be transmitted instantly. This isVideo memoryOne of the important parameters of.
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.Similarly, for 128 bit and 256 bit video memory with a frequency of 500MHz, their video memory bandwidth will be 128 bits=500MHz * 128 ／ 8=8GiB/s, and 256 bits=500MHz * 256 ／ 8=16GiB/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, which is equal to the bit width of video memory particles × the 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.[1]
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There are six common video memory bit widths in the market: 128 bit, 192 bit, 256 bit, 384 bit, 512 bit and 1024 bit. The 128 bit, 256 bit, 384 bit, 512 bit and 1024 bit video cards that people are accustomed to call are their corresponding video memory bit widths.The higher the bit width of video memory, the better the performance, and the higher the price. Therefore, video memory with medium to high bit width is more used in high-end video cards, while ordinary video cards basically use 128 bit width, while 1024 bit video cards belong to the top class.
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There is a relatively simple method, but it is only suitable for general conditions. There are some special cases, and it can be applied in most cases.The packaging forms of video memory mainly includeTSOPAnd BGA, generallyBGA packageThe video memory ofTSOP packageThe particles are 16 bits/piece.If the graphics card uses four BGA packaged video memory, then its bit width is 128 bits. If the graphics card uses eight TSOP packaging particles, then its bit width is 128 bits. However, if the graphics card only uses four TSOP packaging particles, then the video memory bit width is only64 bit。This is just a general technique, which may not meet all conditions. To make the most accurate judgment, you should check the video memory number!
