graphics card comparison (x41/x32)

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I don't see how the graphics card in the x32 is better than the one in x41...?

Intel uses RAM from the memory, but with a lot of memory
(say 1GB), what is the problem? I guess performance do not all come down to the size of the graphics card, but with only 16MB (x32) vs. 128MB (x41) seems like an awful large difference - EVEN when the ATI card is external...

What are the pro's and con's for the different cards?
- battery consumption
- technology, such as engines for shaders etc.
- computer games
- 3D rendering (computer graphics)