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http://live.pirillo.com/ – A shared video card is one that is built in, and shares memory with, the rest of the system. A dedicated video card is independent of the system, and has its own memory that it uses.

Usually, a dedicated video card will perform better when you are doing anything graphically intensive on your system. The more video card memory you have, the smoother things will run and look. One reader wrote in, asking about this issue. His MacBook has a built in video card, and he wondered if he would be able to better manage his HD files with a dedicated video card. For the most part, your MacBook will be able to play and manage the files just fine on its own. However, if you want to get into things like editing, you’re going to be better off getting that external video card. Likewise, if you are into gaming, you will probably find you need that dedicated card.

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Shared vs Dedicated Video Card Memory