It should be automagic. I believe the X3000 can dynamically allocate what is needed. I don't see it lagging unless aero is a lot heavier on the graphics then I think it is. It may skip a little when you first start the 3D alt-tabbing or something but I don't think it will be major.
The graphics card on the laptop you have is worse, if your Pentium D 915 was single core you could argue that a Pentium M is better. The desktop you got will be faster than the laptop.
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