Shared Video Memory and Memory Bandiwidth Issues?

klystron2 asks: "Does shared video memory consume a huge amount of memory bandwidth? We all seem to know that a notebook computer with shared video/main memory will have performance drawbacks.... But what exactly are they? It's easy to see that the amount of main memory decreases a little bit, but that shouldn't make a big difference if you have 1GB of RAM. Does the video card trace through memory every time the screen is refreshed? Therefore consuming a ton of memory bandwidth? If this is the case then the higher the resolution and the higher the refresh rate, the lower the performance of the system, right? I have searched the Internet for an explanation on shared memory and have come up empty. Can anyone explain this?"

Re:Tom's Hardware have an article about that.

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...In concussion, I would not expect integrated graphics to hut general computing performance. Though I would of course check that the graphics performance is adequate, as it may not be possible to update in the future.

Lol... stop banging your head on the desk - then you'll stop getting concussions, and integrated graphics will cease and desist making a hut over computer performance.