Also, I’m assuming this voids the warranty…
No, It is part of the motherboard.
Nope, it is VERY rare to have the ability to upgrade graphics cards on any laptops.
no pretty much all macs are like that unfortunately, because its sealed deep inside and unremovable
Just to clarify, both macs and pcs are very difficult to upgrade the graphics chip. Unlike desktops, graphics cards are typically built to specification.
you might look into expresscard based video options…