On a modern PC, we have many types of memory: RAM, storage memory, and VRAM when we have a desktop or laptop image, which is always a dedicated VRAM, No other process can be assigned of the program unlike standard RAM. Why is that?
Why graphics require dedicated VRAM
System RAM is very good for storing temporary data for running applications, but when it comes to graphics card functions, VRAM is used. This is for two reasons: the first is that some kind of memory, well done of the type of tasks that a graphics card does. The second is that it is very fast and has no GPU central steps (we can say that it has a direct connection), so communication with the graphics processor is faster
VRAM works with the complete autonomy of mechanical RAM, and in fact you will know that they can be in different generations without a problem (for example GDDR6 and DDR4) because at any point they have to do any process together.
And that the main functionality of VRAM is as follows: the GPU produces the image (frame), too Saved to VRAM for display later on screen. Almost this way (as you'll see, system RAM has no effect at all), though you may think this happens many times each second:
If you have to display an image on screen, whether from a game or anything else, this image is first created on the GPU and then written to VRAM. Details are also changed with RAMDAC (The digital-to-analog Converter converter of RAM to analog signals is what the screen shows. Unlike RAM, VRAM chips have two holes, meaning that while the screen reads some data to display it, the GPU simultaneously writes data from in a new image in VRAM, and this process is what prevents blurring from happening among other things.
For embedded drawings that use computer RAM, the whole process should be done in steps: first write in RAM, then show the image, and then processor-controlled RAMDAC. So, everything is slower and tighter, and this is the main reason graphics cards need their dedicated VRAM memory.
Features of why VRAM is important
Adjustment and screen size
The first thing that affects VRAM is the adjustment and screen size. The higher the resolution, the more VRAM we will need since the GPU must draw multiple pixels for each image at a time.
Use of graphics card
The second factor that is influential and therefore important is the type of utility we will provide for the graph. At the end of the day we're talking about displaying images on screen, but don't do the same with a refresh rate of 60 Hz or 240 Hz. In the same way, it's not like using footage you can play rather than watching series or movies and using the Internet. Great GPU usage or change the image every second, the extra amount and speed VRAM will require.
So, you know why graphics have their own dedicated and independent memory, and the summary is that it basically works to handle higher resolutions, with better quality and better performance.
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