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Some graphics cards have memory on board the card itself. Others rely on the memory chips on the system board for memory , thus sharing memory.

Suppose a PC has a specification of 256MB of memory and 64MB shared graphics. The memory available for your operating system and applications will be 192MB.

If a PC had the same specifications but the 64MB were dedicated, the 64MB required to run the card would use this memory, leaving the full 256MB for your operating system and applications.

In short, shared = compromise, dedicated = better.

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