One other thing to bear in mind
Even a cheap, older gen, after market has it's own RAM built in
Integrated graphics do not, they get RAM from from the system
If you are a heavy sample user a graphics card may help you free up some system RAM for your samples.
Does the mobo have an open, unobstructed PCI-E slot? Does the machine have a power supply that has PCI-E power connectors available to power a card? Is the power supply rated to actually run the card at load?