Now no longer available from Dell as a new system purchase, but is in factory outlet. This desktop at one time filled the gap between the media-oriented XPS 420/430 and the high-end XPS 730x. There is no physical difference(s) between the 630 and the 630i.
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moment of inertia. (General Physics) the tendency of a body to resist angular acceleration, expressed as the sum of the products of the mass of each particle in the body and the square of its perpendicular distance from the axis of rotation.