rachitar is right - the gfx card has no effect on the edited video quality. The only effect a separate gfx card will have is that it will free up some of your system memory.
When you use onboard graphics, some of the system memory is allocated for display. If you have a limited amount of RAM, say 256MB, and you use 64MB for display, that leaves 192MB for the rest of the system.
If you use a graphics card, the system can use the whole 256MB for computing. This will make your editing work faster, e.g. when encoding AVI to mpeg. If you have 512MB or more, the speed difference will be quite small.
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