|Its not only the amount of VideoRAM available but the Graphic Processing Unit that matters.|
While the Intel(R) HD Graphics is a reasonable graphics processing unit you are stuck with it and with the amount of RAM that is available to it as the graphics is built into the motherboard and there is no way to upgrade..
This is a limitation on almost all laptops. They were never designed to play hi performance games. If you want high performance graphics you need a desktop,