Yeah, unlike desktops... laptops do not really allow you to upgrade the graphics card / chip. Generally speaking only some of the $1,500+ gaming oriented laptops allows you to upgrade the graphics card and only specific models. There are a some $1,900+ which do not allow you to upgrade so you would need to check 1st before buying.
Anywaste, there are a few "lowly" laptops that allows you to unofficially upgrade the graphics chip, but the vast majority of the time it is simply soldered into place and the BIOS will not likely recognize a different model graphics chip.