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"It is about (...) the memory in which geometric data such as colorimetry are stored and made available to the graphics processor. One can then guess that graphics memory plays a role similar to that of RAM for a computer processor."
Source: http://www.tomsguide.fr/guide/base-Carte-graphique,4-aWRHdWlkZT0zMCZpZENsYXNzZXVyPTUxJmlkUnVicmlxdWU9MjQy.html
Regarding the size of video memory to prioritize for gaming, it depends on:
-the other components of your PC;
-the resolution of your screen;
-the games and the desired quality level.
PS: 2GB (GDDR5) of video memory is sufficient for most games at 1080P.
Source: http://www.tomsguide.fr/guide/base-Carte-graphique,4-aWRHdWlkZT0zMCZpZENsYXNzZXVyPTUxJmlkUnVicmlxdWU9MjQy.html
Regarding the size of video memory to prioritize for gaming, it depends on:
-the other components of your PC;
-the resolution of your screen;
-the games and the desired quality level.
PS: 2GB (GDDR5) of video memory is sufficient for most games at 1080P.