As T.U.B. said, The intergrated video shares your systems ram, External video does have its own.
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Ripped from some website
This is one of the most common of the integrated additional controllers, and unfortunately, usually the worst. The video card is one of the more important performance-related features on a PC; having it included on the motherboard eliminates the possibility of choosing a card to meet your particular needs.
In addition, motherboards with integrated video are notoriously difficult to upgrade. Many that have an option (via jumper or BIOS setting) to disable the on-board video actually still have problems with an add-in upgrade video card, and many come with no ability to disable the built-in video at all! On a lower-end machine however, integrated video can save some cost over buying a separate video card, as well as an expansion slot. These motherboards are often found in the LPX form factor, where saving space and cost is normally a priority.
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If you can add in a video card and even if its the same card, you will see better performance than not using it.