Is the video memory the capacity of the independent graphics card itself?

Is the video memory the capacity of the independent graphics card itself? To increase the video memory can only change the graphics card?

1. For independent graphics, they all have their own memory particles, can be said to be their own unique. If you want to increase the memory, it seems that only a better video card replacement.

2. For integrated graphics is not the case, integrated display cartoon production without video memory, need to occupy system memory. The core video card is the same, so there will be AMD's "core" to the memory frequency needs ~

In most cases, the allocation of video memory of the independent graphics card is still in line with the level of the chip, should not be enough

PS: Add, add video memory can be changed through the memory particles and brush suitable for the BIOS implementation, but more difficult, before the hardware forum appears to have seen instances, but ordinary users do not recommend, but also unconditional DIY