Notebook graphics cards are divided into independent graphics cards and integrated graphics cards.
Integrated graphics card, the motherboard with integrated graphics card chip is called integrated motherboard. Northbridge's integrated graphics card chip is the core of integrated graphics card, and the core and video memory constitute the integrated graphics card. Integrated graphics cards are divided into independent video memory integrated graphics cards, memory split integrated graphics cards and hybrid integrated graphics cards.
Independent video memory integrated graphics card means that there is an independent video memory chip on the motherboard, which does not need system memory and runs independently. Memory Split Integrated Graphics Card, as the name implies, a part of the memory separated from the host system memory is used as video memory for the integrated graphics card to call, which is why it is often seen that the machine with integrated graphics card displays less system memory than the nominal one. Hybrid integrated graphics cards use both independent memory and memory on the motherboard, such as AMD's 780G chipset.
Obviously, the integrated graphics card can't be replaced, because the graphics card is integrated in the North Bridge. As for whether the discrete graphics card can be changed, it depends on the model. The current models are basically welded for the sake of thinness. The so-called independence means that the graphics card chip is independent, not necessarily that the graphics card is alone on a board. Most of the old high-end mobile graphics workstations are pluggable graphics cards.
To sum up, both hard disk and memory can be replaced, but whether the graphics card can be replaced depends on the situation. As far as most models are concerned, the graphics card cannot be replaced separately.