explanation of shared ram use for GPU and system ram.

my system specs are in my signature at the bottom of the post.

I understand what the dedicated ram is for on the GPU itself and what the ram is for the system but why is there shared ram for a CPU with out GPU integrated and no integrated graphics on the motherboard?

where I am seeing this is in Display, Screen resolution, then clicking on Advanced Settings.

I see Total Available Graphics Memory 6869 MB

Dedicated Video Memory 3072 MB

System Video Memory 0 MB

shared System Memory 3797 MB

Why is there shared memory when there is more than enough dedicated memory?

EDIT: Windows 7 Home Premium x64
 

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