Abstract: Printed circuit board has first, second and third sets of connection points operable to connects to first, second and third integrated circuits. Each set of connection points is arranged in a grid pattern having a center pairs of orthogonal axes intersect. The grids define parallel planes. The pairs of orthogonal axes of the second grid are rotated counterclockwise relative to those of the first grid by at least 5 but not more than 25 degrees. Signal connection points in the first and second grids are concentrated in corners closet to the center of the third grid. Signal connection points in the third grid are concentrated in the half closest to the centers of the first and second grids. Alternatively, when signal connection points are concentrated elsewhere in the grid, the pairs of axes for the second grid are rotated relative to those of the first by an amount other than 0, 45, 90, 135, 180, 225, 270 and 315 degrees. First and second sets of mounting holes attach first and second heat dissipators.