The relationship between video memory and game resolution

Video memory is also known as the display RAM, frame cache, which is used to store render data that the display chip has processed or is about to read. Like computer memory, video memory is the hardware used to store graphics data. Display on the display of the screen is composed of pixel points, and each pixel point to 4 to 64 bits of data to control its brightness and color, these points constitute a frame of the graphic picture. In order to keep the screen smooth, to output and to deal with the number of frames of the pixel data must be stored through memory to achieve the buffer effect, and then to display chip and CPU deployment, and finally convert the results of the operation into graphics output to the display.

Game screen resolution and memory of the relationship:

In general, the operation of the 3D game is, the data from the CPU control in advance from the hard disk cache to memory, and then call the required part of the output to the video card, the video card first cached data in memory, and then the GPU began to calculate the need to display the part and output.

So what is the part that needs to be shown, is the pixel point that needs to be displayed according to the game settings, the content of these pixels according to the game's screen effects can be set more or less, if you open more special effects, the amount of data will be very large, memory bandwidth will become a bottleneck, at the same time, the higher the resolution settings, the data will be cached in advance, Capacity will also be limited, when the video memory bandwidth or insufficient capacity of the situation will result in the GPU can not obtain timely data calculation output, the frame number of frames will be very low.

Therefore, the resolution is 2560*1440 in the end how much video memory this is unable to specify a specific value. Can only say more than 1G, at the same time using GDDR5 memory particles better than the GGR3 of the memory particles.

Maximum resolution and required memory space

Ordinary 2D screen: each frame screen required video memory capacity = (horizontal Resolution x vertical resolution X color digits)/8bit ordinary 3D screen: each frame screen required video memory capacity = (horizontal Resolution x vertical resolution X color number x3)/8bit

From the formula can predict the use of high resolution and open full screen anti-aliasing, anisotropic filtering, physical effects simulation, polygon vertex data operations, a large number of three-dimensional function operations, such as advanced screen results, the calculation of slow display chips need more memory space to smooth display. The graphics card even has 1GB or 2GB of video memory, in such cases, memory capacity is no longer the main factor affecting the maximum resolution, and the bandwidth of RAM and GPU computing ability can affect more.