I would like to know what the 1GB, 2GB mean in the graphic cards?? How do they influence the graphic card performance?
I see that you are inquiring about the meaning of the "1GB, 2GB in the graphic cards".
This is the amount of RAM memory that the video controller has dedicated to it. Depending on the games or applications that you are running you may require big amounts of memory to be used by the video controller.
The impact on the performance will depend on the graphics controller, the speed of the memory and the application requirements.