For computers with integrated graphics, it is unnecessary to forcibly allocate memory to video memory. The computer automatically utilizes its memory capacity as video memory based on the graphics card’s requirements.
When a computer with a dedicated graphics card is in use, it prioritizes the dedicated video memory of the graphics card. If the dedicated video memory is insufficient, the computer will then use system memory as video memory. However, since the transfer speed and bandwidth of system memory are generally slower than those of dedicated video memory, the size of the dedicated video memory is closely linked to the performance of the graphics card.
Integrated graphics cards inherently lack dedicated video memory. Consequently, their actual dedicated video memory capacity is 0 (even though the computer may display 512MB, this figure is essentially meaningless). Integrated graphics cards directly utilize system memory as video memory. Allocating system memory to video memory in the BIOS does not enhance the transfer speed of video memory, as this speed is determined by the hardware. Forcing memory allocation to video memory in the BIOS prevents the system memory from being dynamically allocated. In such cases, when the computer requires more memory for CPU operations, the available memory may become insufficient, prompting the computer to allocate part of the disk space as virtual memory, which can significantly slow down the system. Therefore, Why it is unnecessary to allocate dedicated memory for integrated graphics.