Just like computer memory, we could say it is the memories for graphic cards. VRAM is used to store graphical information to be processed. The pictures we see on the display screen are made up of pixels, and each pixel is controlled by 4 to 32 or 64 bits of data to control its brightness and color. These data must be saved through display storage, then allocated by display chip and CPU, and finally converted the calculation results into graphics output to the display. VRAM, like regular RAM, performs the function of storage, but it stores the information of each pixel output to the display by the graphics card.
VRAM is a very important part of graphics card. After processing the data, the display chip will save the data to the display memory. Then RAMDAC (Random Access Memory Digital-to-Analog Converter) reads the data from the display memory and converts the digital signal to analog signal. Finally, the display chip will display the data on the screen.
So you might say, the bigger VRAM we have, the better performance we get? I would say part of it is true. If you add "Comparing two identical graphics cards" in your question. I would say it is true. Bigger VRAM truly helps the graphic card to handle more graphical information, but if the graphic chip cannot handle the information, your extra VRAM is useless. So VRAM is how much information you can handle, but the graphic chip is about if you can handle the information. For example, you have ability to write, but if you don't even know what should you write, then how can you even start your work?
In general, graphic chip is your first focus point, VRAM is a low priority consideration.
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