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[DX9] Software and Hardware Vertex Processing

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Hi!
What's the difference between D3DCREATE_SOFTWARE_VERTEXPROCESSING and D3DCREATE_HARDWARE_VERTEXPROCESSING (while calling CreateDevice())? Does hardware vertex processing have impact only on fixed pipeline, or does it make also vertex shader execute on CPU? I thought that when I'm using vertex shader (in .fx effect file), it is executed always on GPU. I also noticed better performance while drawing complicated geometry with D3DCREATE_HARDWARE_VERTEXPROCESSING. All of directx tutorials I've read instruct to use D3DCREATE_SOFTWARE_VERTEXPROCESSING. I'm confused a bit.
Thanks for help.

[Edited by - miloszmaki on December 26, 2010 4:30:31 PM]

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Does the vertex function run on cpu even when I use effects (.fx) ?
So it's better to use hardware vertex processing, especially with today's graphics cards, isn't it?

[Edited by - miloszmaki on December 27, 2010 5:19:20 AM]

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